37399381 has 2 divisors, whose sum is σ = 37399382. Its totient is φ = 37399380.

The previous prime is 37399363. The next prime is 37399387. The reversal of 37399381 is 18399373.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35343025 + 2056356 = 5945^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 37399381 - 2⁷ = 37399253 is a prime.

It is a super-2 number, since 2×37399381² = 2797427398366322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37399387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18699690 + 18699691.

It is an arithmetic number, because the mean of its divisors is an integer number (18699691).

Almost surely, 2^37399381 is an apocalyptic number.

It is an amenable number.

37399381 is a deficient number, since it is larger than the sum of its proper divisors (1).

37399381 is an equidigital number, since it uses as much as digits as its factorization.

37399381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 37399381 is about 6115.5033316972. The cubic root of 37399381 is about 334.4168394496.

The spelling of 37399381 in words is "thirty-seven million, three hundred ninety-nine thousand, three hundred eighty-one".