39493731 has 4 divisors (see below), whose sum is σ = 52658312. Its totient is φ = 26329152.

The previous prime is 39493717. The next prime is 39493777. The reversal of 39493731 is 13739493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13739493 = 3 ⋅4579831.

It is not a de Polignac number, because 39493731 - 2⁶ = 39493667 is a prime.

It is a super-2 number, since 2×39493731² = 3119509576600722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39493731.

It is not an unprimeable number, because it can be changed into a prime (39493711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6582286 + ... + 6582291.

It is an arithmetic number, because the mean of its divisors is an integer number (13164578).

Almost surely, 2^39493731 is an apocalyptic number.

39493731 is a deficient number, since it is larger than the sum of its proper divisors (13164581).

39493731 is a wasteful number, since it uses less digits than its factorization.

39493731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13164580.

The product of its digits is 61236, while the sum is 39.

The square root of 39493731 is about 6284.4037903368. The cubic root of 39493731 is about 340.5462125776.

The spelling of 39493731 in words is "thirty-nine million, four hundred ninety-three thousand, seven hundred thirty-one".