215445042 has 16 divisors (see below), whose sum is σ = 478766880. Its totient is φ = 71814996.

The previous prime is 215445011. The next prime is 215445067. The reversal of 215445042 is 240544512.

215445042 is a `hidden beast` number, since 2 + 154 + 4 + 504 + 2 = 666.

It is a super-2 number, since 2×215445042² = 92833132244763528, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 215444997 and 215445015.

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, 1994808 + ... + 1994915.

It is an arithmetic number, because the mean of its divisors is an integer number (29922930).

Almost surely, 2^215445042 is an apocalyptic number.

215445042 is an abundant number, since it is smaller than the sum of its proper divisors (263321838).

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

215445042 is a wasteful number, since it uses less digits than its factorization.

215445042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989734 (or 3989728 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 215445042 is about 14678.0462596355. The cubic root of 215445042 is about 599.4857093011.

Adding to 215445042 its reverse (240544512), we get a palindrome (455989554).

The spelling of 215445042 in words is "two hundred fifteen million, four hundred forty-five thousand, forty-two".