1247875903 has 4 divisors (see below), whose sum is σ = 1247950840. Its totient is φ = 1247800968.

The previous prime is 1247875847. The next prime is 1247875919. The reversal of 1247875903 is 3095787421.

1247875903 is a nontrivial binomial coefficient, being equal to C(49958, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3095787421 = 1621 ⋅1909801.

It is a 3-Lehmer number, since φ(1247875903) divides (1247875903-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1247875903 - 2¹⁷ = 1247744831 is a prime.

It is a deceptive number, since it divides R_1247875902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247875003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 49957.

It is an arithmetic number, because the mean of its divisors is an integer number (311987710).

Almost surely, 2^1247875903 is an apocalyptic number.

1247875903 is the 49957-th triangular number and also the 24979-th hexagonal number.

1247875903 is the 16653-rd centered nonagonal number.

1247875903 is a deficient number, since it is larger than the sum of its proper divisors (74937).

1247875903 is an equidigital number, since it uses as much as digits as its factorization.

1247875903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74936.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 1247875903 is about 35325.2870193577. The cubic root of 1247875903 is about 1076.6068353085.

It can be divided in two parts, 1247 and 875903, that added together give a triangular number (877150 = T₁₃₂₄).

The spelling of 1247875903 in words is "one billion, two hundred forty-seven million, eight hundred seventy-five thousand, nine hundred three".