90021394 has 16 divisors (see below), whose sum is σ = 139912920. Its totient is φ = 43388800.

The previous prime is 90021391. The next prime is 90021439. The reversal of 90021394 is 49312009.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48483369 + 41538025 = 6963^2 + 6445^2 .

It is not an unprimeable number, because it can be changed into a prime (90021391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68544 + ... + 69844.

Almost surely, 2^90021394 is an apocalyptic number.

90021394 is a deficient number, since it is larger than the sum of its proper divisors (49891526).

90021394 is a wasteful number, since it uses less digits than its factorization.

90021394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 90021394 is about 9487.9604763089. The cubic root of 90021394 is about 448.1759811658.

The spelling of 90021394 in words is "ninety million, twenty-one thousand, three hundred ninety-four".