18880840234 has 4 divisors (see below), whose sum is σ = 28321260354. Its totient is φ = 9440420116.

The previous prime is 18880840229. The next prime is 18880840241. The reversal of 18880840234 is 43204808881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16416015625 + 2464824609 = 128125^2 + 49647^2 .

It is a super-2 number, since 2×18880840234² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4720210057 + ... + 4720210060.

Almost surely, 2^18880840234 is an apocalyptic number.

18880840234 is a deficient number, since it is larger than the sum of its proper divisors (9440420120).

18880840234 is an equidigital number, since it uses as much as digits as its factorization.

18880840234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9440420119.

The product of its (nonzero) digits is 393216, while the sum is 46.

The spelling of 18880840234 in words is "eighteen billion, eight hundred eighty million, eight hundred forty thousand, two hundred thirty-four".