218622402 has 40 divisors (see below), whose sum is σ = 491114316. Its totient is φ = 72690048.

The previous prime is 218622389. The next prime is 218622409. The reversal of 218622402 is 204226812.

It is a happy number.

218622402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 189365121 + 29257281 = 13761^2 + 5409^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (218622409) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72558 + ... + 75510.

Almost surely, 2^218622402 is an apocalyptic number.

218622402 is an abundant number, since it is smaller than the sum of its proper divisors (272491914).

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

218622402 is a wasteful number, since it uses less digits than its factorization.

218622402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424 (or 3415 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 218622402 is about 14785.8852288255. The cubic root of 218622402 is about 602.4183892261.

It can be divided in two parts, 218622 and 402, that added together give a square (219024 = 468²).

The spelling of 218622402 in words is "two hundred eighteen million, six hundred twenty-two thousand, four hundred two".