261442 has 8 divisors (see below), whose sum is σ = 402876. Its totient is φ = 127152.

The previous prime is 261439. The next prime is 261451. The reversal of 261442 is 244162.

It can be written as a sum of positive squares in 2 ways, for example, as 221841 + 39601 = 471^2 + 199^2 .

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

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 1693 + ... + 1840.

2²⁶¹⁴⁴² is an apocalyptic number.

261442 is a deficient number, since it is larger than the sum of its proper divisors (141434).

261442 is a wasteful number, since it uses less digits than its factorization.

261442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572.

The product of its digits is 384, while the sum is 19.

The square root of 261442 is about 511.3139935500. The cubic root of 261442 is about 63.9428200222.

It can be divided in two parts, 261 and 442, that added together give a triangular number (703 = T₃₇).

The spelling of 261442 in words is "two hundred sixty-one thousand, four hundred forty-two".