388740413 has 2 divisors, whose sum is σ = 388740414. Its totient is φ = 388740412.

The previous prime is 388740379. The next prime is 388740421. The reversal of 388740413 is 314047883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376476409 + 12264004 = 19403^2 + 3502^2 .

It is an emirp because it is prime and its reverse (314047883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388740413 - 2²² = 384546109 is a prime.

It is a super-2 number, since 2×388740413² = 302238217398821138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388740433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194370206 + 194370207.

It is an arithmetic number, because the mean of its divisors is an integer number (194370207).

Almost surely, 2^388740413 is an apocalyptic number.

It is an amenable number.

388740413 is a deficient number, since it is larger than the sum of its proper divisors (1).

388740413 is an equidigital number, since it uses as much as digits as its factorization.

388740413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 388740413 is about 19716.5010333984. The cubic root of 388740413 is about 729.8269515381.

The spelling of 388740413 in words is "three hundred eighty-eight million, seven hundred forty thousand, four hundred thirteen".