845642 has 12 divisors (see below), whose sum is σ = 1475730. Its totient is φ = 362376.

The previous prime is 845623. The next prime is 845653. The reversal of 845642 is 246548.

It can be written as a sum of positive squares in only one way, i.e., 625681 + 219961 = 791^2 + 469^2 .

It is a super-2 number, since 2×845642² = 1430220784328, which contains 22 as substring.

It is an unprimeable number.

845642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4217 + ... + 4412.

2⁸⁴⁵⁶⁴² is an apocalyptic number.

845642 is a deficient number, since it is larger than the sum of its proper divisors (630088).

845642 is a wasteful number, since it uses less digits than its factorization.

845642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645 (or 8638 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 845642 is about 919.5879512042. The cubic root of 845642 is about 94.5646562555.

The spelling of 845642 in words is "eight hundred forty-five thousand, six hundred forty-two".