402442646 has 4 divisors (see below), whose sum is σ = 603663972. Its totient is φ = 201221322.

The previous prime is 402442643. The next prime is 402442679. The reversal of 402442646 is 646244204.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402442643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610660 + ... + 100610663.

It is an arithmetic number, because the mean of its divisors is an integer number (150915993).

Almost surely, 2^402442646 is an apocalyptic number.

402442646 is a deficient number, since it is larger than the sum of its proper divisors (201221326).

402442646 is a wasteful number, since it uses less digits than its factorization.

402442646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201221325.

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 402442646 is about 20060.9732067016. The cubic root of 402442646 is about 738.3030546153.

The spelling of 402442646 in words is "four hundred two million, four hundred forty-two thousand, six hundred forty-six".