39890899 has 4 divisors (see below), whose sum is σ = 41990440. Its totient is φ = 37791360.

The previous prime is 39890881. The next prime is 39890933. The reversal of 39890899 is 99809893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39890899 - 2¹⁷ = 39759827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39890819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049742 + ... + 1049779.

It is an arithmetic number, because the mean of its divisors is an integer number (10497610).

Almost surely, 2^39890899 is an apocalyptic number.

39890899 is a deficient number, since it is larger than the sum of its proper divisors (2099541).

39890899 is a wasteful number, since it uses less digits than its factorization.

39890899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099540.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 39890899 is about 6315.9242395710. The cubic root of 39890899 is about 341.6839727370.

The spelling of 39890899 in words is "thirty-nine million, eight hundred ninety thousand, eight hundred ninety-nine".