39801990 has 64 divisors (see below), whose sum is σ = 98496000. Its totient is φ = 10289664.

The previous prime is 39801989. The next prime is 39802013. The reversal of 39801990 is 9910893.

39801990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 199911 + ... + 200109.

It is an arithmetic number, because the mean of its divisors is an integer number (1539000).

Almost surely, 2^39801990 is an apocalyptic number.

39801990 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 39801990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49248000).

39801990 is an abundant number, since it is smaller than the sum of its proper divisors (58694010).

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

39801990 is a wasteful number, since it uses less digits than its factorization.

39801990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 39801990 is about 6308.8818343665. The cubic root of 39801990 is about 341.4299350280.

The spelling of 39801990 in words is "thirty-nine million, eight hundred one thousand, nine hundred ninety".