38013821 has 4 divisors (see below), whose sum is σ = 38063772. Its totient is φ = 37963872.

The previous prime is 38013817. The next prime is 38013823. The reversal of 38013821 is 12831083.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4778596 + 33235225 = 2186^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 38013821 - 2² = 38013817 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 (38013823) 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, 23816 + ... + 25361.

It is an arithmetic number, because the mean of its divisors is an integer number (9515943).

Almost surely, 2^38013821 is an apocalyptic number.

It is an amenable number.

38013821 is a deficient number, since it is larger than the sum of its proper divisors (49951).

38013821 is an equidigital number, since it uses as much as digits as its factorization.

38013821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49950.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 38013821 is about 6165.5349321855. The cubic root of 38013821 is about 336.2382952675.

The spelling of 38013821 in words is "thirty-eight million, thirteen thousand, eight hundred twenty-one".