1278261903 has 16 divisors (see below), whose sum is σ = 1791126656. Its totient is φ = 809857440.

The previous prime is 1278261899. The next prime is 1278261953. The reversal of 1278261903 is 3091628721.

It is not a de Polignac number, because 1278261903 - 2² = 1278261899 is a prime.

It is a super-2 number, since 2×1278261903² = 3267906985322362818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278261953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129133 + ... + 138678.

It is an arithmetic number, because the mean of its divisors is an integer number (111945416).

Almost surely, 2^1278261903 is an apocalyptic number.

1278261903 is a deficient number, since it is larger than the sum of its proper divisors (512864753).

1278261903 is a wasteful number, since it uses less digits than its factorization.

1278261903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267894.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1278261903 is about 35752.7887443763. The cubic root of 1278261903 is about 1085.2753739090.

The spelling of 1278261903 in words is "one billion, two hundred seventy-eight million, two hundred sixty-one thousand, nine hundred three".