218398734 has 16 divisors (see below), whose sum is σ = 485330640. Its totient is φ = 72799560.

The previous prime is 218398723. The next prime is 218398781. The reversal of 218398734 is 437893812.

It is a self number, because there is not a number n which added to its sum of digits gives 218398734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2022157 + ... + 2022264.

It is an arithmetic number, because the mean of its divisors is an integer number (30333165).

Almost surely, 2^218398734 is an apocalyptic number.

218398734 is an abundant number, since it is smaller than the sum of its proper divisors (266931906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218398734 is a wasteful number, since it uses less digits than its factorization.

218398734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044432 (or 4044426 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 218398734 is about 14778.3197285754. The cubic root of 218398734 is about 602.2128785806.

The spelling of 218398734 in words is "two hundred eighteen million, three hundred ninety-eight thousand, seven hundred thirty-four".