1247623923 has 64 divisors (see below), whose sum is σ = 2224947200. Its totient is φ = 603262080.

The previous prime is 1247623921. The next prime is 1247623963. The reversal of 1247623923 is 3293267421.

It is not a de Polignac number, because 1247623923 - 2¹ = 1247623921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1247623921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156918 + ... + 164676.

It is an arithmetic number, because the mean of its divisors is an integer number (34764800).

Almost surely, 2^1247623923 is an apocalyptic number.

1247623923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1247623923 is a deficient number, since it is larger than the sum of its proper divisors (977323277).

1247623923 is a wasteful number, since it uses less digits than its factorization.

1247623923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832.

The product of its digits is 108864, while the sum is 39.

The square root of 1247623923 is about 35321.7202723763. The cubic root of 1247623923 is about 1076.5343650542.

The spelling of 1247623923 in words is "one billion, two hundred forty-seven million, six hundred twenty-three thousand, nine hundred twenty-three".