39405989 has 8 divisors (see below), whose sum is σ = 45080448. Its totient is φ = 33742800.

The previous prime is 39405937. The next prime is 39405997. The reversal of 39405989 is 98950493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39405989 - 2⁸ = 39405733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39405089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6944 + ... + 11270.

It is an arithmetic number, because the mean of its divisors is an integer number (5635056).

Almost surely, 2^39405989 is an apocalyptic number.

It is an amenable number.

39405989 is a deficient number, since it is larger than the sum of its proper divisors (5674459).

39405989 is a wasteful number, since it uses less digits than its factorization.

39405989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 39405989 is about 6277.4189759805. The cubic root of 39405989 is about 340.2938319224.

The spelling of 39405989 in words is "thirty-nine million, four hundred five thousand, nine hundred eighty-nine".