37916421 has 4 divisors (see below), whose sum is σ = 50555232. Its totient is φ = 25277612.

The previous prime is 37916383. The next prime is 37916429. The reversal of 37916421 is 12461973.

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: 12461973 = 3 ⋅4153991.

It is a cyclic number.

It is not a de Polignac number, because 37916421 - 2⁷ = 37916293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37916429) 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, 6319401 + ... + 6319406.

It is an arithmetic number, because the mean of its divisors is an integer number (12638808).

Almost surely, 2^37916421 is an apocalyptic number.

It is an amenable number.

37916421 is a deficient number, since it is larger than the sum of its proper divisors (12638811).

37916421 is a wasteful number, since it uses less digits than its factorization.

37916421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12638810.

The product of its digits is 9072, while the sum is 33.

The square root of 37916421 is about 6157.6311191886. The cubic root of 37916421 is about 335.9508768180.

The spelling of 37916421 in words is "thirty-seven million, nine hundred sixteen thousand, four hundred twenty-one".