402006642 has 32 divisors (see below), whose sum is σ = 832870080. Its totient is φ = 129205440.

The previous prime is 402006629. The next prime is 402006659. The reversal of 402006642 is 246600204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202768 + ... + 204740.

It is an arithmetic number, because the mean of its divisors is an integer number (26027190).

Almost surely, 2^402006642 is an apocalyptic number.

402006642 is an abundant number, since it is smaller than the sum of its proper divisors (430863438).

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

402006642 is a wasteful number, since it uses less digits than its factorization.

402006642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178.

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

The square root of 402006642 is about 20050.1032915045. The cubic root of 402006642 is about 738.0363338726.

Adding to 402006642 its reverse (246600204), we get a palindrome (648606846).

The spelling of 402006642 in words is "four hundred two million, six thousand, six hundred forty-two".