39813421 has 4 divisors (see below), whose sum is σ = 39850812. Its totient is φ = 39776032.

The previous prime is 39813413. The next prime is 39813469. The reversal of 39813421 is 12431893.

39813421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4351396 + 35462025 = 2086^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 39813421 - 2³ = 39813413 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 (39813401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17050 + ... + 19243.

It is an arithmetic number, because the mean of its divisors is an integer number (9962703).

Almost surely, 2^39813421 is an apocalyptic number.

It is an amenable number.

39813421 is a deficient number, since it is larger than the sum of its proper divisors (37391).

39813421 is a wasteful number, since it uses less digits than its factorization.

39813421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37390.

The product of its digits is 5184, while the sum is 31.

The square root of 39813421 is about 6309.7877143371. The cubic root of 39813421 is about 341.4626177491.

The spelling of 39813421 in words is "thirty-nine million, eight hundred thirteen thousand, four hundred twenty-one".