261478 has 16 divisors (see below), whose sum is σ = 472320. Its totient is φ = 106056.

The previous prime is 261467. The next prime is 261509. The reversal of 261478 is 874162.

261478 = T₄₂ + T₄₃ + ... + T₁₁₇.

261478 is nontrivially palindromic in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226 + ... + 757.

It is an arithmetic number, because the mean of its divisors is an integer number (29520).

2²⁶¹⁴⁷⁸ is an apocalyptic number.

261478 is a deficient number, since it is larger than the sum of its proper divisors (210842).

261478 is a wasteful number, since it uses less digits than its factorization.

261478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011.

The product of its digits is 2688, while the sum is 28.

The square root of 261478 is about 511.3491957557. The cubic root of 261478 is about 63.9457548171.

The spelling of 261478 in words is "two hundred sixty-one thousand, four hundred seventy-eight".