218690396 has 12 divisors (see below), whose sum is σ = 382949448. Its totient is φ = 109276272.

The previous prime is 218690393. The next prime is 218690401. The reversal of 218690396 is 693096812.

218690396 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218690393) 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, 9731 + ... + 23066.

It is an arithmetic number, because the mean of its divisors is an integer number (31912454).

Almost surely, 2^218690396 is an apocalyptic number.

It is an amenable number.

218690396 is a deficient number, since it is larger than the sum of its proper divisors (164259052).

218690396 is a wasteful number, since it uses less digits than its factorization.

218690396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34468 (or 34466 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 218690396 is about 14788.1843375040. The cubic root of 218690396 is about 602.4808356938.

The spelling of 218690396 in words is "two hundred eighteen million, six hundred ninety thousand, three hundred ninety-six".