39931380 has 90 divisors (see below), whose sum is σ = 126069174. Its totient is φ = 10580544.

The previous prime is 39931373. The next prime is 39931457. The reversal of 39931380 is 8313993.

39931380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 467856 + 39463524 = 684^2 + 6282^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 254262 + ... + 254418.

Almost surely, 2^39931380 is an apocalyptic number.

39931380 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39931380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63034587).

39931380 is an abundant number, since it is smaller than the sum of its proper divisors (86137794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39931380 is a wasteful number, since it uses less digits than its factorization.

39931380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 39931380 is about 6319.1281044144. The cubic root of 39931380 is about 341.7995131494.

The spelling of 39931380 in words is "thirty-nine million, nine hundred thirty-one thousand, three hundred eighty".