8403813 has 18 divisors (see below), whose sum is σ = 13344422. Its totient is φ = 5092560.

The previous prime is 8403803. The next prime is 8403817. The reversal of 8403813 is 3183048.

It can be written as a sum of positive squares in only one way, i.e., 7144929 + 1258884 = 2673^2 + 1122^2 .

It is not a de Polignac number, because 8403813 - 2⁸ = 8403557 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8403817) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2770 + ... + 4947.

Almost surely, 2^8403813 is an apocalyptic number.

It is an amenable number.

8403813 is a deficient number, since it is larger than the sum of its proper divisors (4940609).

8403813 is a wasteful number, since it uses less digits than its factorization.

8403813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7745 (or 7731 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 8403813 is about 2898.9330796001. The cubic root of 8403813 is about 203.3100247999.

It can be divided in two parts, 8403 and 813, that added together give a square (9216 = 96²).

The spelling of 8403813 in words is "eight million, four hundred three thousand, eight hundred thirteen".