39940823 has 8 divisors (see below), whose sum is σ = 43220016. Its totient is φ = 36691200.

The previous prime is 39940819. The next prime is 39940841. The reversal of 39940823 is 32804993.

39940823 = 72² + 73² + ... + 493².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39940823 - 2² = 39940819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39945823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4538 + ... + 10023.

It is an arithmetic number, because the mean of its divisors is an integer number (5402502).

Almost surely, 2^39940823 is an apocalyptic number.

39940823 is a deficient number, since it is larger than the sum of its proper divisors (3279193).

39940823 is a wasteful number, since it uses less digits than its factorization.

39940823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14785.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 39940823 is about 6319.8752361103. The cubic root of 39940823 is about 341.8264540199.

The spelling of 39940823 in words is "thirty-nine million, nine hundred forty thousand, eight hundred twenty-three".