39977890 has 16 divisors (see below), whose sum is σ = 72044280. Its totient is φ = 15972480.

The previous prime is 39977857. The next prime is 39977891. The reversal of 39977890 is 9877993.

It can be written as a sum of positive squares in 4 ways, for example, as 21427641 + 18550249 = 4629^2 + 4307^2 .

It is not an unprimeable number, because it can be changed into a prime (39977891) 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, 9520 + ... + 13060.

Almost surely, 2^39977890 is an apocalyptic number.

39977890 is a deficient number, since it is larger than the sum of its proper divisors (32066390).

39977890 is a wasteful number, since it uses less digits than its factorization.

39977890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 39977890 is about 6322.8071297486. The cubic root of 39977890 is about 341.9321651081.

The spelling of 39977890 in words is "thirty-nine million, nine hundred seventy-seven thousand, eight hundred ninety".