402705009 has 12 divisors (see below), whose sum is σ = 664782976. Its totient is φ = 230117112.

The previous prime is 402705007. The next prime is 402705047. The reversal of 402705009 is 900507204.

It is not a de Polignac number, because 402705009 - 2¹ = 402705007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402705007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3196009 + ... + 3196134.

Almost surely, 2^402705009 is an apocalyptic number.

It is an amenable number.

402705009 is a deficient number, since it is larger than the sum of its proper divisors (262077967).

402705009 is a wasteful number, since it uses less digits than its factorization.

402705009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392156 (or 6392153 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 402705009 is about 20067.5112806745. The cubic root of 402705009 is about 738.4634595227.

The spelling of 402705009 in words is "four hundred two million, seven hundred five thousand, nine".