39864421 has 4 divisors (see below), whose sum is σ = 40109152. Its totient is φ = 39619692.

The previous prime is 39864389. The next prime is 39864443. The reversal of 39864421 is 12446893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39864421 - 2⁵ = 39864389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39864491) 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, 122121 + ... + 122446.

It is an arithmetic number, because the mean of its divisors is an integer number (10027288).

Almost surely, 2^39864421 is an apocalyptic number.

It is an amenable number.

39864421 is a deficient number, since it is larger than the sum of its proper divisors (244731).

39864421 is a wasteful number, since it uses less digits than its factorization.

39864421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244730.

The product of its digits is 41472, while the sum is 37.

The square root of 39864421 is about 6313.8277613505. The cubic root of 39864421 is about 341.6083572382.

The spelling of 39864421 in words is "thirty-nine million, eight hundred sixty-four thousand, four hundred twenty-one".