39940497 has 24 divisors (see below), whose sum is σ = 61368840. Its totient is φ = 24944640.

The previous prime is 39940487. The next prime is 39940529. The reversal of 39940497 is 79404993.

It can be written as a sum of positive squares in 4 ways, for example, as 3651921 + 36288576 = 1911^2 + 6024^2 .

It is not a de Polignac number, because 39940497 - 2¹¹ = 39938449 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39940477) 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 23 ways as a sum of consecutive naturals, for example, 42529 + ... + 43457.

It is an arithmetic number, because the mean of its divisors is an integer number (2557035).

Almost surely, 2^39940497 is an apocalyptic number.

It is an amenable number.

39940497 is a deficient number, since it is larger than the sum of its proper divisors (21428343).

39940497 is a wasteful number, since it uses less digits than its factorization.

39940497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1230 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 39940497 is about 6319.8494444093. The cubic root of 39940497 is about 341.8255240130.

The spelling of 39940497 in words is "thirty-nine million, nine hundred forty thousand, four hundred ninety-seven".