1636642 has 8 divisors (see below), whose sum is σ = 2805696. Its totient is φ = 701412.

The previous prime is 1636637. The next prime is 1636651. The reversal of 1636642 is 2466361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1636642.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58438 + ... + 58465.

It is an arithmetic number, because the mean of its divisors is an integer number (350712).

2^1636642 is an apocalyptic number.

1636642 is a deficient number, since it is larger than the sum of its proper divisors (1169054).

1636642 is a wasteful number, since it uses less digits than its factorization.

1636642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116912.

The product of its digits is 5184, while the sum is 28.

The square root of 1636642 is about 1279.3130969391. The cubic root of 1636642 is about 117.8468279748.

It can be divided in two parts, 1636 and 642, that added together give a triangular number (2278 = T₆₇).

The spelling of 1636642 in words is "one million, six hundred thirty-six thousand, six hundred forty-two".