38745991 has 4 divisors (see below), whose sum is σ = 39276832. Its totient is φ = 38215152.

The previous prime is 38745989. The next prime is 38746003. The reversal of 38745991 is 19954783.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19954783 = 113 ⋅176591.

It is a cyclic number.

It is not a de Polignac number, because 38745991 - 2¹ = 38745989 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 (38745191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265311 + ... + 265456.

It is an arithmetic number, because the mean of its divisors is an integer number (9819208).

Almost surely, 2^38745991 is an apocalyptic number.

38745991 is a deficient number, since it is larger than the sum of its proper divisors (530841).

38745991 is an equidigital number, since it uses as much as digits as its factorization.

38745991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530840.

The product of its digits is 272160, while the sum is 46.

The square root of 38745991 is about 6224.6277800363. The cubic root of 38745991 is about 338.3833023066.

The spelling of 38745991 in words is "thirty-eight million, seven hundred forty-five thousand, nine hundred ninety-one".