402457609 has 4 divisors (see below), whose sum is σ = 426131604. Its totient is φ = 378783616.

The previous prime is 402457579. The next prime is 402457633. The reversal of 402457609 is 906754204.

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 264160009 + 138297600 = 16253^2 + 11760^2 .

It is a cyclic number.

It is not a de Polignac number, because 402457609 - 2⁵ = 402457577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402457669) 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, 11836972 + ... + 11837005.

It is an arithmetic number, because the mean of its divisors is an integer number (106532901).

Almost surely, 2^402457609 is an apocalyptic number.

It is an amenable number.

402457609 is a deficient number, since it is larger than the sum of its proper divisors (23673995).

402457609 is a wasteful number, since it uses less digits than its factorization.

402457609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23673994.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 402457609 is about 20061.3461412738. The cubic root of 402457609 is about 738.3122046494.

The spelling of 402457609 in words is "four hundred two million, four hundred fifty-seven thousand, six hundred nine".