18747907929 has 9 divisors (see below), whose sum is σ = 27080904799. Its totient is φ = 12498331440.

The previous prime is 18747907889. The next prime is 18747907949. The reversal of 18747907929 is 92970974781.

The square root of 18747907929 is 136923.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8755906329 + 9992001600 = 93573^2 + 99960^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18747907929 - 2¹⁷ = 18747776857 is a prime.

It is a super-2 number, since 2×18747907929² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18747907949) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 387949 + ... + 433589.

Almost surely, 2^18747907929 is an apocalyptic number.

18747907929 is the 136923-rd square number.

18747907929 is the 68462-nd centered octagonal number.

It is an amenable number.

18747907929 is a deficient number, since it is larger than the sum of its proper divisors (8332996870).

18747907929 is an frugal number, since it uses more digits than its factorization.

18747907929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91288 (or 45644 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 63.

The spelling of 18747907929 in words is "eighteen billion, seven hundred forty-seven million, nine hundred seven thousand, nine hundred twenty-nine".