90421947 has 128 divisors (see below), whose sum is σ = 182845440. Its totient is φ = 42768000.

The previous prime is 90421939. The next prime is 90421951. The reversal of 90421947 is 74912409.

It is not a de Polignac number, because 90421947 - 2³ = 90421939 is a prime.

It is a super-2 number, since 2×90421947² = 16352256998541618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90421907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1482297 + ... + 1482357.

It is an arithmetic number, because the mean of its divisors is an integer number (1428480).

Almost surely, 2^90421947 is an apocalyptic number.

90421947 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

90421947 is a wasteful number, since it uses less digits than its factorization.

90421947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 90421947 is about 9509.0455356992. The cubic root of 90421947 is about 448.8397220268.

The spelling of 90421947 in words is "ninety million, four hundred twenty-one thousand, nine hundred forty-seven".