402640206 has 16 divisors (see below), whose sum is σ = 852650064. Its totient is φ = 126318464.

The previous prime is 402640177. The next prime is 402640241. The reversal of 402640206 is 602046204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1973625 + ... + 1973828.

It is an arithmetic number, because the mean of its divisors is an integer number (53290629).

Almost surely, 2^402640206 is an apocalyptic number.

402640206 is an abundant number, since it is smaller than the sum of its proper divisors (450009858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402640206 is a wasteful number, since it uses less digits than its factorization.

402640206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947475.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 402640206 is about 20065.8965909824. The cubic root of 402640206 is about 738.4238463952.

The spelling of 402640206 in words is "four hundred two million, six hundred forty thousand, two hundred six".