37721597940 has 480 divisors, whose sum is σ = 138516618240. Its totient is φ = 8510054400.

The previous prime is 37721597933. The next prime is 37721597983. The reversal of 37721597940 is 4979512773.

37721597940 is a `hidden beast` number, since 3 + 7 + 7 + 2 + 1 + 597 + 9 + 40 = 666.

37721597940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×37721597940² (a number of 22 digits) contains 22 as substring.

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 polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12402820 + ... + 12405860.

It is an arithmetic number, because the mean of its divisors is an integer number (288576288).

Almost surely, 2^37721597940 is an apocalyptic number.

37721597940 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 37721597940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69258309120).

37721597940 is an abundant number, since it is smaller than the sum of its proper divisors (100795020300).

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

37721597940 is a wasteful number, since it uses less digits than its factorization.

37721597940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The spelling of 37721597940 in words is "thirty-seven billion, seven hundred twenty-one million, five hundred ninety-seven thousand, nine hundred forty".