90439945 has 8 divisors (see below), whose sum is σ = 109603080. Its totient is φ = 71635200.

The previous prime is 90439939. The next prime is 90439957. The reversal of 90439945 is 54993409.

It can be written as a sum of positive squares in 4 ways, for example, as 26183689 + 64256256 = 5117^2 + 8016^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90439945 - 2²⁵ = 56885513 is a prime.

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, 89040 + ... + 90049.

It is an arithmetic number, because the mean of its divisors is an integer number (13700385).

Almost surely, 2^90439945 is an apocalyptic number.

It is an amenable number.

90439945 is a deficient number, since it is larger than the sum of its proper divisors (19163135).

90439945 is a wasteful number, since it uses less digits than its factorization.

90439945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179195.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 90439945 is about 9509.9918506800. The cubic root of 90439945 is about 448.8694997584.

The spelling of 90439945 in words is "ninety million, four hundred thirty-nine thousand, nine hundred forty-five".