38149391 has 6 divisors (see below), whose sum is σ = 44377920. Its totient is φ = 32699436.

The previous prime is 38149381. The next prime is 38149399. The reversal of 38149391 is 19394183.

It is a happy number.

It is not a de Polignac number, because 38149391 - 2¹⁸ = 37887247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38149399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 389231 + ... + 389328.

It is an arithmetic number, because the mean of its divisors is an integer number (7396320).

Almost surely, 2^38149391 is an apocalyptic number.

38149391 is a deficient number, since it is larger than the sum of its proper divisors (6228529).

38149391 is an equidigital number, since it uses as much as digits as its factorization.

38149391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778573 (or 778566 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 38149391 is about 6176.5193272587. The cubic root of 38149391 is about 336.6375337773.

The spelling of 38149391 in words is "thirty-eight million, one hundred forty-nine thousand, three hundred ninety-one".