38991313 has 4 divisors (see below), whose sum is σ = 39195648. Its totient is φ = 38786980.

The previous prime is 38991311. The next prime is 38991343. The reversal of 38991313 is 31319983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38991313 - 2¹ = 38991311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38991311) 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, 101881 + ... + 102262.

It is an arithmetic number, because the mean of its divisors is an integer number (9798912).

Almost surely, 2^38991313 is an apocalyptic number.

It is an amenable number.

38991313 is a deficient number, since it is larger than the sum of its proper divisors (204335).

38991313 is a wasteful number, since it uses less digits than its factorization.

38991313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204334.

The product of its digits is 17496, while the sum is 37.

The square root of 38991313 is about 6244.3024430276. The cubic root of 38991313 is about 339.0959634114.

It can be divided in two parts, 38991 and 313, that added together give a cube (39304 = 34³).

The spelling of 38991313 in words is "thirty-eight million, nine hundred ninety-one thousand, three hundred thirteen".