261089238 has 16 divisors (see below), whose sum is σ = 544882176. Its totient is φ = 83245800.

The previous prime is 261089237. The next prime is 261089239. The reversal of 261089238 is 832980162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261089237) and next prime (261089239).

It is a junction number, because it is equal to n+sod(n) for n = 261089196 and 261089205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261089237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945838 + ... + 946113.

It is an arithmetic number, because the mean of its divisors is an integer number (34055136).

Almost surely, 2^261089238 is an apocalyptic number.

261089238 is an abundant number, since it is smaller than the sum of its proper divisors (283792938).

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

261089238 is a wasteful number, since it uses less digits than its factorization.

261089238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891979.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 261089238 is about 16158.2560321342. The cubic root of 261089238 is about 639.1404786648.

The spelling of 261089238 in words is "two hundred sixty-one million, eighty-nine thousand, two hundred thirty-eight".