402840686 has 4 divisors (see below), whose sum is σ = 604261032. Its totient is φ = 201420342.

The previous prime is 402840667. The next prime is 402840743. The reversal of 402840686 is 686048204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100710170 + ... + 100710173.

It is an arithmetic number, because the mean of its divisors is an integer number (151065258).

Almost surely, 2^402840686 is an apocalyptic number.

402840686 is a deficient number, since it is larger than the sum of its proper divisors (201420346).

402840686 is a wasteful number, since it uses less digits than its factorization.

402840686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201420345.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 402840686 is about 20070.8915098458. The cubic root of 402840686 is about 738.5463831307.

The spelling of 402840686 in words is "four hundred two million, eight hundred forty thousand, six hundred eighty-six".