37421381 has 2 divisors, whose sum is σ = 37421382. Its totient is φ = 37421380.

The previous prime is 37421357. The next prime is 37421383. The reversal of 37421381 is 18312473.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 8702500 = 5359^2 + 2950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37421381 is a prime.

It is a super-2 number, since 2×37421381² = 2800719511894322, which contains 22 as substring.

Together with 37421383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37421383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18710690 + 18710691.

It is an arithmetic number, because the mean of its divisors is an integer number (18710691).

Almost surely, 2^37421381 is an apocalyptic number.

It is an amenable number.

37421381 is a deficient number, since it is larger than the sum of its proper divisors (1).

37421381 is an equidigital number, since it uses as much as digits as its factorization.

37421381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 37421381 is about 6117.3017744754. The cubic root of 37421381 is about 334.4823996108.

The spelling of 37421381 in words is "thirty-seven million, four hundred twenty-one thousand, three hundred eighty-one".