37721420 has 48 divisors (see below), whose sum is σ = 89220096. Its totient is φ = 13272000.

The previous prime is 37721417. The next prime is 37721447. The reversal of 37721420 is 2412773.

It is a self number, because there is not a number n which added to its sum of digits gives 37721420.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4055 + ... + 9585.

It is an arithmetic number, because the mean of its divisors is an integer number (1858752).

Almost surely, 2^37721420 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 37721420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44610048).

37721420 is an abundant number, since it is smaller than the sum of its proper divisors (51498676).

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

37721420 is a wasteful number, since it uses less digits than its factorization.

37721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582 (or 5580 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 37721420 is about 6141.7766159313. The cubic root of 37721420 is about 335.3739642065.

The spelling of 37721420 in words is "thirty-seven million, seven hundred twenty-one thousand, four hundred twenty".