39999420 has 60 divisors (see below), whose sum is σ = 125484744. Its totient is φ = 10666080.

The previous prime is 39999391. The next prime is 39999431. The reversal of 39999420 is 2499993.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10726 + ... + 13965.

Almost surely, 2^39999420 is an apocalyptic number.

39999420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39999420 is an abundant number, since it is smaller than the sum of its proper divisors (85485324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39999420 is a wasteful number, since it uses less digits than its factorization.

39999420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24712 (or 24701 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 39999420 is about 6324.5094671445. The cubic root of 39999420 is about 341.9935363506.

The spelling of 39999420 in words is "thirty-nine million, nine hundred ninety-nine thousand, four hundred twenty".