218451142 has 32 divisors (see below), whose sum is σ = 417211200. Its totient is φ = 83438208.

The previous prime is 218451127. The next prime is 218451143. The reversal of 218451142 is 241154812.

It is a super-2 number, since 2×218451142² = 95441802882208328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218451142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218451143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15417 + ... + 25972.

It is an arithmetic number, because the mean of its divisors is an integer number (13037850).

Almost surely, 2^218451142 is an apocalyptic number.

218451142 is a deficient number, since it is larger than the sum of its proper divisors (198760058).

218451142 is a wasteful number, since it uses less digits than its factorization.

218451142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41440.

The product of its digits is 2560, while the sum is 28.

The square root of 218451142 is about 14780.0927601961. The cubic root of 218451142 is about 602.2610446845.

The spelling of 218451142 in words is "two hundred eighteen million, four hundred fifty-one thousand, one hundred forty-two".