39977645 has 4 divisors (see below), whose sum is σ = 47973180. Its totient is φ = 31982112.

The previous prime is 39977621. The next prime is 39977669. The reversal of 39977645 is 54677993.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (39977621) and next prime (39977669).

It can be written as a sum of positive squares in 2 ways, for example, as 31292836 + 8684809 = 5594^2 + 2947^2 .

It is a cyclic number.

It is not a de Polignac number, because 39977645 - 2⁸ = 39977389 is a prime.

It is a super-3 number, since 3×39977645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39977593 and 39977602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3997760 + ... + 3997769.

It is an arithmetic number, because the mean of its divisors is an integer number (11993295).

Almost surely, 2^39977645 is an apocalyptic number.

It is an amenable number.

39977645 is a deficient number, since it is larger than the sum of its proper divisors (7995535).

39977645 is an equidigital number, since it uses as much as digits as its factorization.

39977645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7995534.

The product of its digits is 1428840, while the sum is 50.

The square root of 39977645 is about 6322.7877554130. The cubic root of 39977645 is about 341.9314666090.

The spelling of 39977645 in words is "thirty-nine million, nine hundred seventy-seven thousand, six hundred forty-five".