37991980 has 48 divisors (see below), whose sum is σ = 87776640. Its totient is φ = 13724928.

The previous prime is 37991977. The next prime is 37991983. The reversal of 37991980 is 8919973.

It is an interprime number because it is at equal distance from previous prime (37991977) and next prime (37991983).

It is a self number, because there is not a number n which added to its sum of digits gives 37991980.

It is not an unprimeable number, because it can be changed into a prime (37991983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10666 + ... + 13774.

It is an arithmetic number, because the mean of its divisors is an integer number (1828680).

Almost surely, 2^37991980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 37991980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43888320).

37991980 is an abundant number, since it is smaller than the sum of its proper divisors (49784660).

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

37991980 is a wasteful number, since it uses less digits than its factorization.

37991980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178 (or 3176 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 37991980 is about 6163.7634607438. The cubic root of 37991980 is about 336.1738872239.

The spelling of 37991980 in words is "thirty-seven million, nine hundred ninety-one thousand, nine hundred eighty".