261942 has 16 divisors (see below), whose sum is σ = 529200. Its totient is φ = 86432.

The previous prime is 261917. The next prime is 261959. The reversal of 261942 is 249162.

It is a super-2 number, since 2×261942² = 137227222728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748 + ... + 1040.

It is an arithmetic number, because the mean of its divisors is an integer number (33075).

2²⁶¹⁹⁴² is an apocalyptic number.

261942 is an abundant number, since it is smaller than the sum of its proper divisors (267258).

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

261942 is a wasteful number, since it uses less digits than its factorization.

261942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its digits is 864, while the sum is 24.

The square root of 261942 is about 511.8026963587. The cubic root of 261942 is about 63.9835569737.

The spelling of 261942 in words is "two hundred sixty-one thousand, nine hundred forty-two".