90439965 has 96 divisors (see below), whose sum is σ = 200318976. Its totient is φ = 36650880.

The previous prime is 90439963. The next prime is 90439967. The reversal of 90439965 is 56993409.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90439963) and next prime (90439967).

It is not a de Polignac number, because 90439965 - 2¹ = 90439963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 90439965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90439961) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 148692 + ... + 149298.

It is an arithmetic number, because the mean of its divisors is an integer number (2086656).

Almost surely, 2^90439965 is an apocalyptic number.

It is an amenable number.

90439965 is an abundant number, since it is smaller than the sum of its proper divisors (109879011).

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

90439965 is a wasteful number, since it uses less digits than its factorization.

90439965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 90439965 is about 9509.9929022056. The cubic root of 90439965 is about 448.8695328463.

The spelling of 90439965 in words is "ninety million, four hundred thirty-nine thousand, nine hundred sixty-five".