39040031 has 4 divisors (see below), whose sum is σ = 39385632. Its totient is φ = 38694432.

The previous prime is 39040021. The next prime is 39040037. The reversal of 39040031 is 13004093.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39040031 is a prime.

It is a super-2 number, since 2×39040031² = 3048248040961922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39039985 and 39040012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39040037) 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, 172631 + ... + 172856.

It is an arithmetic number, because the mean of its divisors is an integer number (9846408).

Almost surely, 2^39040031 is an apocalyptic number.

39040031 is a deficient number, since it is larger than the sum of its proper divisors (345601).

39040031 is a wasteful number, since it uses less digits than its factorization.

39040031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345600.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 39040031 is about 6248.2022214394. The cubic root of 39040031 is about 339.2371333307.

The spelling of 39040031 in words is "thirty-nine million, forty thousand, thirty-one".