90829921 has 16 divisors (see below), whose sum is σ = 116653824. Its totient is φ = 68739264.

The previous prime is 90829913. The next prime is 90829939. The reversal of 90829921 is 12992809.

It is a cyclic number.

It is not a de Polignac number, because 90829921 - 2³ = 90829913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90829021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19606 + ... + 23791.

It is an arithmetic number, because the mean of its divisors is an integer number (7290864).

Almost surely, 2^90829921 is an apocalyptic number.

90829921 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90829921 is a deficient number, since it is larger than the sum of its proper divisors (25823903).

90829921 is a wasteful number, since it uses less digits than its factorization.

90829921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43440.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 90829921 is about 9530.4732831061. The cubic root of 90829921 is about 449.5137480159.

The spelling of 90829921 in words is "ninety million, eight hundred twenty-nine thousand, nine hundred twenty-one".