38013993 has 6 divisors (see below), whose sum is σ = 54909114. Its totient is φ = 25342656.

The previous prime is 38013959. The next prime is 38014013. The reversal of 38013993 is 39931083.

It can be written as a sum of positive squares in only one way, i.e., 27594009 + 10419984 = 5253^2 + 3228^2 .

It is not a de Polignac number, because 38013993 - 2¹² = 38009897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38013293) 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, 2111880 + ... + 2111897.

It is an arithmetic number, because the mean of its divisors is an integer number (9151519).

Almost surely, 2^38013993 is an apocalyptic number.

It is an amenable number.

38013993 is a deficient number, since it is larger than the sum of its proper divisors (16895121).

38013993 is a wasteful number, since it uses less digits than its factorization.

38013993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223783 (or 4223780 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 38013993 is about 6165.5488806756. The cubic root of 38013993 is about 336.2388023892.

The spelling of 38013993 in words is "thirty-eight million, thirteen thousand, nine hundred ninety-three".