90439397 has 4 divisors (see below), whose sum is σ = 91455660. Its totient is φ = 89423136.

The previous prime is 90439361. The next prime is 90439417. The reversal of 90439397 is 79393409.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79393409 = 59 ⋅1345651.

It can be written as a sum of positive squares in 2 ways, for example, as 38613796 + 51825601 = 6214^2 + 7199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90439397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90439357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507998 + ... + 508175.

It is an arithmetic number, because the mean of its divisors is an integer number (22863915).

Almost surely, 2^90439397 is an apocalyptic number.

It is an amenable number.

90439397 is a deficient number, since it is larger than the sum of its proper divisors (1016263).

90439397 is a wasteful number, since it uses less digits than its factorization.

90439397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016262.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 90439397 is about 9509.9630388346. The cubic root of 90439397 is about 448.8685931495.

The spelling of 90439397 in words is "ninety million, four hundred thirty-nine thousand, three hundred ninety-seven".