37999961 has 4 divisors (see below), whose sum is σ = 38064000. Its totient is φ = 37935924.

The previous prime is 37999957. The next prime is 37999987. The reversal of 37999961 is 16999973.

37999961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16999973 = 199 ⋅85427.

It is a cyclic number.

It is not a de Polignac number, because 37999961 - 2² = 37999957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37999901) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 31121 + ... + 32318.

It is an arithmetic number, because the mean of its divisors is an integer number (9516000).

Almost surely, 2^37999961 is an apocalyptic number.

It is an amenable number.

37999961 is a deficient number, since it is larger than the sum of its proper divisors (64039).

37999961 is an equidigital number, since it uses as much as digits as its factorization.

37999961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64038.

The product of its digits is 826686, while the sum is 53.

The square root of 37999961 is about 6164.4108396505. The cubic root of 37999961 is about 336.1974256649.

The spelling of 37999961 in words is "thirty-seven million, nine hundred ninety-nine thousand, nine hundred sixty-one".