38999989 has 32 divisors (see below), whose sum is σ = 50872320. Its totient is φ = 29092608.

The previous prime is 38999981. The next prime is 38999993. The reversal of 38999989 is 98999983.

It is a cyclic number.

It is not a de Polignac number, because 38999989 - 2³ = 38999981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38999989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38999981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106084 + ... + 106450.

It is an arithmetic number, because the mean of its divisors is an integer number (1589760).

Almost surely, 2^38999989 is an apocalyptic number.

It is an amenable number.

38999989 is a deficient number, since it is larger than the sum of its proper divisors (11872331).

38999989 is a wasteful number, since it uses less digits than its factorization.

38999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its digits is 11337408, while the sum is 64.

The square root of 38999989 is about 6244.9971176935. The cubic root of 38999989 is about 339.1211124182.

The spelling of 38999989 in words is "thirty-eight million, nine hundred ninety-nine thousand, nine hundred eighty-nine".