402253609 has 12 divisors (see below), whose sum is σ = 431569548. Its totient is φ = 374816000.

The previous prime is 402253597. The next prime is 402253637. The reversal of 402253609 is 906352204.

It can be written as a sum of positive squares in 6 ways, for example, as 137475625 + 264777984 = 11725^2 + 16272^2 .

It is not a de Polignac number, because 402253609 - 2²¹ = 400156457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402253639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22299 + ... + 36079.

It is an arithmetic number, because the mean of its divisors is an integer number (35964129).

Almost surely, 2^402253609 is an apocalyptic number.

It is an amenable number.

402253609 is a deficient number, since it is larger than the sum of its proper divisors (29315939).

402253609 is a wasteful number, since it uses less digits than its factorization.

402253609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13916 (or 13899 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 402253609 is about 20056.2610922375. The cubic root of 402253609 is about 738.1874369373.

It can be divided in two parts, 40225 and 3609, that added together give a palindrome (43834).

The spelling of 402253609 in words is "four hundred two million, two hundred fifty-three thousand, six hundred nine".