8402509906 has 48 divisors (see below), whose sum is σ = 15058786680. Its totient is φ = 3503969280.

The previous prime is 8402509889. The next prime is 8402509933. The reversal of 8402509906 is 6099052048.

It can be written as a sum of positive squares in 4 ways, for example, as 4295622681 + 4106887225 = 65541^2 + 64085^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1640806 + ... + 1645918.

Almost surely, 2^8402509906 is an apocalyptic number.

8402509906 is a deficient number, since it is larger than the sum of its proper divisors (6656276774).

8402509906 is a wasteful number, since it uses less digits than its factorization.

8402509906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5579 (or 5572 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 8402509906 is about 91665.2055362339. The cubic root of 8402509906 is about 2032.9951584926.

The spelling of 8402509906 in words is "eight billion, four hundred two million, five hundred nine thousand, nine hundred six".