38731813 has 4 divisors (see below), whose sum is σ = 38803948. Its totient is φ = 38659680.

The previous prime is 38731801. The next prime is 38731843. The reversal of 38731813 is 31813783.

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 15864289 + 22867524 = 3983^2 + 4782^2 .

It is a cyclic number.

It is not a de Polignac number, because 38731813 - 2¹⁷ = 38600741 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 (38731843) 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, 35256 + ... + 36337.

It is an arithmetic number, because the mean of its divisors is an integer number (9700987).

Almost surely, 2^38731813 is an apocalyptic number.

It is an amenable number.

38731813 is a deficient number, since it is larger than the sum of its proper divisors (72135).

38731813 is an equidigital number, since it uses as much as digits as its factorization.

38731813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72134.

The product of its digits is 12096, while the sum is 34.

The square root of 38731813 is about 6223.4888125552. The cubic root of 38731813 is about 338.3420233369.

The spelling of 38731813 in words is "thirty-eight million, seven hundred thirty-one thousand, eight hundred thirteen".