39945977 has 4 divisors (see below), whose sum is σ = 41025636. Its totient is φ = 38866320.

The previous prime is 39945973. The next prime is 39946001. The reversal of 39945977 is 77954993.

It is a happy number.

39945977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77954993 = 5279 ⋅14767.

It can be written as a sum of positive squares in 2 ways, for example, as 38738176 + 1207801 = 6224^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 39945977 - 2² = 39945973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39945973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539774 + ... + 539847.

It is an arithmetic number, because the mean of its divisors is an integer number (10256409).

Almost surely, 2^39945977 is an apocalyptic number.

39945977 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

39945977 is a deficient number, since it is larger than the sum of its proper divisors (1079659).

39945977 is a wasteful number, since it uses less digits than its factorization.

39945977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079658.

The product of its digits is 2143260, while the sum is 53.

The square root of 39945977 is about 6320.2829841709. The cubic root of 39945977 is about 341.8411565860.

The spelling of 39945977 in words is "thirty-nine million, nine hundred forty-five thousand, nine hundred seventy-seven".