37999421 has 4 divisors (see below), whose sum is σ = 38033532. Its totient is φ = 37965312.

The previous prime is 37999417. The next prime is 37999433. The reversal of 37999421 is 12499973.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12499973 = 2909 ⋅4297.

It can be written as a sum of positive squares in 2 ways, for example, as 34351321 + 3648100 = 5861^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 37999421 - 2² = 37999417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37999441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15326 + ... + 17631.

It is an arithmetic number, because the mean of its divisors is an integer number (9508383).

Almost surely, 2^37999421 is an apocalyptic number.

It is an amenable number.

37999421 is a deficient number, since it is larger than the sum of its proper divisors (34111).

37999421 is a wasteful number, since it uses less digits than its factorization.

37999421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34110.

The product of its digits is 122472, while the sum is 44.

The square root of 37999421 is about 6164.3670396887. The cubic root of 37999421 is about 336.1958331416.

The spelling of 37999421 in words is "thirty-seven million, nine hundred ninety-nine thousand, four hundred twenty-one".