88399921 has 2 divisors, whose sum is σ = 88399922. Its totient is φ = 88399920.

The previous prime is 88399907. The next prime is 88399931. The reversal of 88399921 is 12999388.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87609600 + 790321 = 9360^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 88399921 - 2⁵ = 88399889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (88399901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44199960 + 44199961.

It is an arithmetic number, because the mean of its divisors is an integer number (44199961).

Almost surely, 2^88399921 is an apocalyptic number.

It is an amenable number.

88399921 is a deficient number, since it is larger than the sum of its proper divisors (1).

88399921 is an equidigital number, since it uses as much as digits as its factorization.

88399921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 88399921 is about 9402.1232176567. The cubic root of 88399921 is about 445.4688002342.

The spelling of 88399921 in words is "eighty-eight million, three hundred ninety-nine thousand, nine hundred twenty-one".