37999 has 8 divisors (see below), whose sum is σ = 42560. Its totient is φ = 33696.

The previous prime is 37997. The next prime is 38011. The reversal of 37999 is 99973.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 37999 - 2¹ = 37997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

37999 is a modest number, since divided by 999 gives 37 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37991) 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, 442 + ... + 520.

It is an arithmetic number, because the mean of its divisors is an integer number (5320).

2³⁷⁹⁹⁹ is an apocalyptic number.

37999 is a deficient number, since it is larger than the sum of its proper divisors (4561).

37999 is a wasteful number, since it uses less digits than its factorization.

37999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129.

The product of its digits is 15309, while the sum is 37.

The square root of 37999 is about 194.9333219334. The cubic root of 37999 is about 33.6194591553.

It can be divided in two parts, 3799 and 9, that multiplied together give a triangular number (34191 = T₂₆₁).

The spelling of 37999 in words is "thirty-seven thousand, nine hundred ninety-nine".