99981390 has 16 divisors (see below), whose sum is σ = 239955408. Its totient is φ = 26661696.

The previous prime is 99981389. The next prime is 99981421. The reversal of 99981390 is 9318999.

It is a congruent number.

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, 1666327 + ... + 1666386.

It is an arithmetic number, because the mean of its divisors is an integer number (14997213).

Almost surely, 2^99981390 is an apocalyptic number.

99981390 is an abundant number, since it is smaller than the sum of its proper divisors (139974018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99981390 is a wasteful number, since it uses less digits than its factorization.

99981390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332723.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 99981390 is about 9999.0694567045. The cubic root of 99981390 is about 464.1300882522.

The spelling of 99981390 in words is "ninety-nine million, nine hundred eighty-one thousand, three hundred ninety".