37947640 has 32 divisors (see below), whose sum is σ = 85639680. Its totient is φ = 15133312.

The previous prime is 37947601. The next prime is 37947641. The reversal of 37947640 is 4674973.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 37947593 and 37947602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37947641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14082 + ... + 16558.

It is an arithmetic number, because the mean of its divisors is an integer number (2676240).

Almost surely, 2^37947640 is an apocalyptic number.

It is an amenable number.

37947640 is an abundant number, since it is smaller than the sum of its proper divisors (47692040).

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

37947640 is a wasteful number, since it uses less digits than its factorization.

37947640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871 (or 2867 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 37947640 is about 6160.1655821901. The cubic root of 37947640 is about 336.0430547624.

The spelling of 37947640 in words is "thirty-seven million, nine hundred forty-seven thousand, six hundred forty".