88390009 has 2 divisors, whose sum is σ = 88390010. Its totient is φ = 88390008.

The previous prime is 88390007. The next prime is 88390031. The reversal of 88390009 is 90009388.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66064384 + 22325625 = 8128^2 + 4725^2 .

It is a cyclic number.

It is not a de Polignac number, because 88390009 - 2¹ = 88390007 is a prime.

Together with 88390007, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 88390009.

It is not a weakly prime, because it can be changed into another prime (88390007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44195004 + 44195005.

It is an arithmetic number, because the mean of its divisors is an integer number (44195005).

Almost surely, 2^88390009 is an apocalyptic number.

It is an amenable number.

88390009 is a deficient number, since it is larger than the sum of its proper divisors (1).

88390009 is an equidigital number, since it uses as much as digits as its factorization.

88390009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 88390009 is about 9401.5960878991. The cubic root of 88390009 is about 445.4521499486.

The spelling of 88390009 in words is "eighty-eight million, three hundred ninety thousand, nine".