39121990 has 8 divisors (see below), whose sum is σ = 70419600. Its totient is φ = 15648792.

The previous prime is 39121963. The next prime is 39122023. The reversal of 39121990 is 9912193.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956090 + ... + 1956109.

It is an arithmetic number, because the mean of its divisors is an integer number (8802450).

Almost surely, 2^39121990 is an apocalyptic number.

39121990 is a deficient number, since it is larger than the sum of its proper divisors (31297610).

39121990 is a wasteful number, since it uses less digits than its factorization.

39121990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912206.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 39121990 is about 6254.7573893797. The cubic root of 39121990 is about 339.4743607922.

The spelling of 39121990 in words is "thirty-nine million, one hundred twenty-one thousand, nine hundred ninety".