90215942 has 4 divisors (see below), whose sum is σ = 135323916. Its totient is φ = 45107970.

The previous prime is 90215903. The next prime is 90215977. The reversal of 90215942 is 24951209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24951209 = 37 ⋅674357.

It is a junction number, because it is equal to n+sod(n) for n = 90215899 and 90215908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22553984 + ... + 22553987.

It is an arithmetic number, because the mean of its divisors is an integer number (33830979).

Almost surely, 2^90215942 is an apocalyptic number.

90215942 is a deficient number, since it is larger than the sum of its proper divisors (45107974).

90215942 is a wasteful number, since it uses less digits than its factorization.

90215942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45107973.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 90215942 is about 9498.2073045391. The cubic root of 90215942 is about 448.4986044938.

The spelling of 90215942 in words is "ninety million, two hundred fifteen thousand, nine hundred forty-two".