39899790 has 160 divisors (see below), whose sum is σ = 127125504. Its totient is φ = 8786880.

The previous prime is 39899749. The next prime is 39899803. The reversal of 39899790 is 9799893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 175657 + ... + 175883.

Almost surely, 2^39899790 is an apocalyptic number.

39899790 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 39899790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63562752).

39899790 is an abundant number, since it is smaller than the sum of its proper divisors (87225714).

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

39899790 is a wasteful number, since it uses less digits than its factorization.

39899790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 39899790 is about 6316.6280561705. The cubic root of 39899790 is about 341.7093560250.

The spelling of 39899790 in words is "thirty-nine million, eight hundred ninety-nine thousand, seven hundred ninety".