39972737 has 4 divisors (see below), whose sum is σ = 45683136. Its totient is φ = 34262340.

The previous prime is 39972731. The next prime is 39972743. The reversal of 39972737 is 73727993.

It is a happy number.

39972737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73727993 = 59 ⋅1249627.

It is an interprime number because it is at equal distance from previous prime (39972731) and next prime (39972743).

It is a de Polignac number, because none of the positive numbers 2^k-39972737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39972691 and 39972700.

It is not an unprimeable number, because it can be changed into a prime (39972731) 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 3 ways as a sum of consecutive naturals, for example, 2855189 + ... + 2855202.

It is an arithmetic number, because the mean of its divisors is an integer number (11420784).

Almost surely, 2^39972737 is an apocalyptic number.

It is an amenable number.

39972737 is a deficient number, since it is larger than the sum of its proper divisors (5710399).

39972737 is an equidigital number, since it uses as much as digits as its factorization.

39972737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710398.

The product of its digits is 500094, while the sum is 47.

The square root of 39972737 is about 6322.3996235607. The cubic root of 39972737 is about 341.9174732192.

The spelling of 39972737 in words is "thirty-nine million, nine hundred seventy-two thousand, seven hundred thirty-seven".