39940437 has 16 divisors (see below), whose sum is σ = 54750528. Its totient is φ = 25883520.

The previous prime is 39940409. The next prime is 39940469. The reversal of 39940437 is 73404993.

It is not a de Polignac number, because 39940437 - 2²⁰ = 38891861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39940395 and 39940404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39940477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54123 + ... + 54855.

It is an arithmetic number, because the mean of its divisors is an integer number (3421908).

Almost surely, 2^39940437 is an apocalyptic number.

It is an amenable number.

39940437 is a deficient number, since it is larger than the sum of its proper divisors (14810091).

39940437 is a wasteful number, since it uses less digits than its factorization.

39940437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 39940437 is about 6319.8446974589. The cubic root of 39940437 is about 341.8253528455.

The spelling of 39940437 in words is "thirty-nine million, nine hundred forty thousand, four hundred thirty-seven".