37999987 has 2 divisors, whose sum is σ = 37999988. Its totient is φ = 37999986.

The previous prime is 37999957. The next prime is 37999991. The reversal of 37999987 is 78999973.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 37999987 - 2⁷ = 37999859 is a prime.

It is not a weakly prime, because it can be changed into another prime (37999957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18999993 + 18999994.

It is an arithmetic number, because the mean of its divisors is an integer number (18999994).

Almost surely, 2^37999987 is an apocalyptic number.

37999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

37999987 is an equidigital number, since it uses as much as digits as its factorization.

37999987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 61.

The square root of 37999987 is about 6164.4129485296. The cubic root of 37999987 is about 336.1975023416.

The spelling of 37999987 in words is "thirty-seven million, nine hundred ninety-nine thousand, nine hundred eighty-seven".