39940397 has 8 divisors (see below), whose sum is σ = 47630976. Its totient is φ = 32746032.

The previous prime is 39940387. The next prime is 39940403. The reversal of 39940397 is 79304993.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 39940397 - 2⁶ = 39940333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39940387) 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, 123878 + ... + 124199.

It is an arithmetic number, because the mean of its divisors is an integer number (5953872).

Almost surely, 2^39940397 is an apocalyptic number.

It is an amenable number.

39940397 is a deficient number, since it is larger than the sum of its proper divisors (7690579).

39940397 is a wasteful number, since it uses less digits than its factorization.

39940397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248107.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 39940397 is about 6319.8415328234. The cubic root of 39940397 is about 341.8252387337.

The spelling of 39940397 in words is "thirty-nine million, nine hundred forty thousand, three hundred ninety-seven".