869642 has 4 divisors (see below), whose sum is σ = 1304466. Its totient is φ = 434820.

The previous prime is 869599. The next prime is 869657. The reversal of 869642 is 246968.

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., 579121 + 290521 = 761^2 + 539^2 .

It is an Ulam number.

It is an unprimeable number.

869642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217409 + ... + 217412.

2⁸⁶⁹⁶⁴² is an apocalyptic number.

869642 is a deficient number, since it is larger than the sum of its proper divisors (434824).

869642 is a wasteful number, since it uses less digits than its factorization.

869642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434823.

The product of its digits is 20736, while the sum is 35.

The square root of 869642 is about 932.5459774188. The cubic root of 869642 is about 95.4509309976.

The spelling of 869642 in words is "eight hundred sixty-nine thousand, six hundred forty-two".