1247872973 has 4 divisors (see below), whose sum is σ = 1249319808. Its totient is φ = 1246426140.

The previous prime is 1247872957. The next prime is 1247872991. The reversal of 1247872973 is 3792787421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3792787421 = 89 ⋅42615589.

It is a cyclic number.

It is not a de Polignac number, because 1247872973 - 2⁴ = 1247872957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247872993) 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, 722123 + ... + 723848.

It is an arithmetic number, because the mean of its divisors is an integer number (312329952).

Almost surely, 2^1247872973 is an apocalyptic number.

It is an amenable number.

1247872973 is a deficient number, since it is larger than the sum of its proper divisors (1446835).

1247872973 is an equidigital number, since it uses as much as digits as its factorization.

1247872973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446834.

The product of its digits is 1185408, while the sum is 50.

The square root of 1247872973 is about 35325.2455476250. The cubic root of 1247872973 is about 1076.6059926872.

The spelling of 1247872973 in words is "one billion, two hundred forty-seven million, eight hundred seventy-two thousand, nine hundred seventy-three".