37864649 has 2 divisors, whose sum is σ = 37864650. Its totient is φ = 37864648.

The previous prime is 37864613. The next prime is 37864679. The reversal of 37864649 is 94646873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22024249 + 15840400 = 4693^2 + 3980^2 .

It is an emirp because it is prime and its reverse (94646873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37864649 is a prime.

It is not a weakly prime, because it can be changed into another prime (37864679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18932324 + 18932325.

It is an arithmetic number, because the mean of its divisors is an integer number (18932325).

Almost surely, 2^37864649 is an apocalyptic number.

It is an amenable number.

37864649 is a deficient number, since it is larger than the sum of its proper divisors (1).

37864649 is an equidigital number, since it uses as much as digits as its factorization.

37864649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 37864649 is about 6153.4257938160. The cubic root of 37864649 is about 335.7979020158.

The spelling of 37864649 in words is "thirty-seven million, eight hundred sixty-four thousand, six hundred forty-nine".