13930813 has 4 divisors (see below), whose sum is σ = 15002428. Its totient is φ = 12859200.

The previous prime is 13930799. The next prime is 13930823. The reversal of 13930813 is 31803931.

13930813 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, and also an emirpimes, since its reverse is a distinct semiprime: 31803931 = 107 ⋅297233.

It can be written as a sum of positive squares in 2 ways, for example, as 5008644 + 8922169 = 2238^2 + 2987^2 .

It is a cyclic number.

It is not a de Polignac number, because 13930813 - 2¹³ = 13922621 is a prime.

It is a super-3 number, since 3×13930813³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13930823) 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, 535788 + ... + 535813.

It is an arithmetic number, because the mean of its divisors is an integer number (3750607).

Almost surely, 2^13930813 is an apocalyptic number.

13930813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13930813 is a deficient number, since it is larger than the sum of its proper divisors (1071615).

13930813 is a wasteful number, since it uses less digits than its factorization.

13930813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071614.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 13930813 is about 3732.4004340371. The cubic root of 13930813 is about 240.6165455623.

The spelling of 13930813 in words is "thirteen million, nine hundred thirty thousand, eight hundred thirteen".