39689381990 has 32 divisors (see below), whose sum is σ = 72023986944. Its totient is φ = 15746587360.

The previous prime is 39689381917. The next prime is 39689382023. The reversal of 39689381990 is 9918398693.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754445 + ... + 805335.

It is an arithmetic number, because the mean of its divisors is an integer number (2250749592).

Almost surely, 2^39689381990 is an apocalyptic number.

39689381990 is a deficient number, since it is larger than the sum of its proper divisors (32334604954).

39689381990 is a wasteful number, since it uses less digits than its factorization.

39689381990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51532.

The product of its (nonzero) digits is 22674816, while the sum is 65.

The spelling of 39689381990 in words is "thirty-nine billion, six hundred eighty-nine million, three hundred eighty-one thousand, nine hundred ninety".