403213509 has 6 divisors (see below), whose sum is σ = 582419526. Its totient is φ = 268809000.

The previous prime is 403213501. The next prime is 403213541. The reversal of 403213509 is 905312304.

It can be written as a sum of positive squares in only one way, i.e., 216972900 + 186240609 = 14730^2 + 13647^2 .

It is not a de Polignac number, because 403213509 - 2³ = 403213501 is a prime.

It is a super-2 number, since 2×403213509² = 325162267680186162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403213501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22400742 + ... + 22400759.

It is an arithmetic number, because the mean of its divisors is an integer number (97069921).

Almost surely, 2^403213509 is an apocalyptic number.

It is an amenable number.

403213509 is a deficient number, since it is larger than the sum of its proper divisors (179206017).

403213509 is a wasteful number, since it uses less digits than its factorization.

403213509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44801507 (or 44801504 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 403213509 is about 20080.1770161520. The cubic root of 403213509 is about 738.7741507389.

The spelling of 403213509 in words is "four hundred three million, two hundred thirteen thousand, five hundred nine".