18934709428 has 12 divisors (see below), whose sum is σ = 34576426080. Its totient is φ = 9055730552.

The previous prime is 18934709383. The next prime is 18934709447. The reversal of 18934709428 is 82490743981.

It is a super-2 number, since 2×18934709428² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102905938 + ... + 102906121.

It is an arithmetic number, because the mean of its divisors is an integer number (2881368840).

Almost surely, 2^18934709428 is an apocalyptic number.

It is an amenable number.

18934709428 is a deficient number, since it is larger than the sum of its proper divisors (15641716652).

18934709428 is a wasteful number, since it uses less digits than its factorization.

18934709428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205812086 (or 205812084 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 18934709428 in words is "eighteen billion, nine hundred thirty-four million, seven hundred nine thousand, four hundred twenty-eight".