39720051 has 48 divisors (see below), whose sum is σ = 71635200. Its totient is φ = 21485088.

The previous prime is 39720019. The next prime is 39720059. The reversal of 39720051 is 15002793.

39720051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39720051 - 2⁵ = 39720019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 39719997 and 39720024.

It is not an unprimeable number, because it can be changed into a prime (39720059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31705 + ... + 32933.

It is an arithmetic number, because the mean of its divisors is an integer number (1492400).

Almost surely, 2^39720051 is an apocalyptic number.

39720051 is a deficient number, since it is larger than the sum of its proper divisors (31915149).

39720051 is a wasteful number, since it uses less digits than its factorization.

39720051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 39720051 is about 6302.3845487244. The cubic root of 39720051 is about 341.1954773416.

The spelling of 39720051 in words is "thirty-nine million, seven hundred twenty thousand, fifty-one".