39966997 has 6 divisors (see below), whose sum is σ = 46492278. Its totient is φ = 34257384.

The previous prime is 39966977. The next prime is 39967003. The reversal of 39966997 is 79966993.

It can be written as a sum of positive squares in only one way, i.e., 26615281 + 13351716 = 5159^2 + 3654^2 .

It is not a de Polignac number, because 39966997 - 2¹¹ = 39964949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39966917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 407778 + ... + 407875.

It is an arithmetic number, because the mean of its divisors is an integer number (7748713).

Almost surely, 2^39966997 is an apocalyptic number.

It is an amenable number.

39966997 is a deficient number, since it is larger than the sum of its proper divisors (6525281).

39966997 is an equidigital number, since it uses as much as digits as its factorization.

39966997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815667 (or 815660 counting only the distinct ones).

The product of its digits is 4960116, while the sum is 58.

The square root of 39966997 is about 6321.9456656950. The cubic root of 39966997 is about 341.9011062284.

The spelling of 39966997 in words is "thirty-nine million, nine hundred sixty-six thousand, nine hundred ninety-seven".