402662642 has 4 divisors (see below), whose sum is σ = 603993966. Its totient is φ = 201331320.

The previous prime is 402662641. The next prime is 402662693. The reversal of 402662642 is 246266204.

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

It can be written as a sum of positive squares in only one way, i.e., 203034001 + 199628641 = 14249^2 + 14129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402662599 and 402662608.

It is not an unprimeable number, because it can be changed into a prime (402662641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100665659 + ... + 100665662.

Almost surely, 2^402662642 is an apocalyptic number.

402662642 is a deficient number, since it is larger than the sum of its proper divisors (201331324).

402662642 is a wasteful number, since it uses less digits than its factorization.

402662642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201331323.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 402662642 is about 20066.4556411938. The cubic root of 402662642 is about 738.4375616753.

It can be divided in two parts, 402662 and 642, that added together give a palindrome (403304).

The spelling of 402662642 in words is "four hundred two million, six hundred sixty-two thousand, six hundred forty-two".