38018521 has 8 divisors (see below), whose sum is σ = 39335688. Its totient is φ = 36720000.

The previous prime is 38018509. The next prime is 38018531. The reversal of 38018521 is 12581083.

38018521 = 640² + 641² + ... + 721².

It can be written as a sum of positive squares in 4 ways, for example, as 8042896 + 29975625 = 2836^2 + 5475^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38018521 - 2⁵ = 38018489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38018521.

It is not an unprimeable number, because it can be changed into a prime (38018501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450 + ... + 8731.

It is an arithmetic number, because the mean of its divisors is an integer number (4916961).

Almost surely, 2^38018521 is an apocalyptic number.

It is an amenable number.

38018521 is a deficient number, since it is larger than the sum of its proper divisors (1317167).

38018521 is a wasteful number, since it uses less digits than its factorization.

38018521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 38018521 is about 6165.9160714366. The cubic root of 38018521 is about 336.2521521124.

The spelling of 38018521 in words is "thirty-eight million, eighteen thousand, five hundred twenty-one".