261434638 has 8 divisors (see below), whose sum is σ = 397675440. Its totient is φ = 128876160.

The previous prime is 261434617. The next prime is 261434689. The reversal of 261434638 is 836434162.

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

It is a junction number, because it is equal to n+sod(n) for n = 261434597 and 261434606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920403 + ... + 920686.

It is an arithmetic number, because the mean of its divisors is an integer number (49709430).

Almost surely, 2^261434638 is an apocalyptic number.

261434638 is a deficient number, since it is larger than the sum of its proper divisors (136240802).

261434638 is a wasteful number, since it uses less digits than its factorization.

261434638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841162.

The product of its digits is 82944, while the sum is 37.

The square root of 261434638 is about 16168.9405342465. The cubic root of 261434638 is about 639.4221982353.

The spelling of 261434638 in words is "two hundred sixty-one million, four hundred thirty-four thousand, six hundred thirty-eight".