38413891 has 2 divisors, whose sum is σ = 38413892. Its totient is φ = 38413890.

The previous prime is 38413883. The next prime is 38413909. The reversal of 38413891 is 19831483.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38413891 - 2³ = 38413883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38413891.

It is not a weakly prime, because it can be changed into another prime (38413831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19206945 + 19206946.

It is an arithmetic number, because the mean of its divisors is an integer number (19206946).

Almost surely, 2^38413891 is an apocalyptic number.

38413891 is a deficient number, since it is larger than the sum of its proper divisors (1).

38413891 is an equidigital number, since it uses as much as digits as its factorization.

38413891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 38413891 is about 6197.8940778300. The cubic root of 38413891 is about 337.4137421995.

It can be divided in two parts, 38413 and 891, that added together give a cube (39304 = 34³).

The spelling of 38413891 in words is "thirty-eight million, four hundred thirteen thousand, eight hundred ninety-one".