18906929 has 4 divisors (see below), whose sum is σ = 18923520. Its totient is φ = 18890340.

The previous prime is 18906917. The next prime is 18906961. The reversal of 18906929 is 92960981.

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.

It is a cyclic number.

It is not a de Polignac number, because 18906929 - 2⁴ = 18906913 is a prime.

It is a super-2 number, since 2×18906929² = 714943928422082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18906929.

It is not an unprimeable number, because it can be changed into a prime (18900929) 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, 6449 + ... + 8910.

It is an arithmetic number, because the mean of its divisors is an integer number (4730880).

Almost surely, 2^18906929 is an apocalyptic number.

It is an amenable number.

18906929 is a deficient number, since it is larger than the sum of its proper divisors (16591).

18906929 is a wasteful number, since it uses less digits than its factorization.

18906929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16590.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 18906929 is about 4348.2098615407. The cubic root of 18906929 is about 266.4037483278.

The spelling of 18906929 in words is "eighteen million, nine hundred six thousand, nine hundred twenty-nine".