215543042 has 16 divisors (see below), whose sum is σ = 379838592. Its totient is φ = 90437520.

The previous prime is 215543033. The next prime is 215543063. The reversal of 215543042 is 240345512.

It is a happy number.

It is a super-2 number, since 2×215543042² = 92917605909227528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376538 + ... + 377109.

It is an arithmetic number, because the mean of its divisors is an integer number (23739912).

Almost surely, 2^215543042 is an apocalyptic number.

215543042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

215543042 is a deficient number, since it is larger than the sum of its proper divisors (164295550).

215543042 is a wasteful number, since it uses less digits than its factorization.

215543042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753673.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 215543042 is about 14681.3841990461. The cubic root of 215543042 is about 599.5765920205.

Adding to 215543042 its reverse (240345512), we get a palindrome (455888554).

The spelling of 215543042 in words is "two hundred fifteen million, five hundred forty-three thousand, forty-two".