261234420 has 48 divisors (see below), whose sum is σ = 769957440. Its totient is φ = 65995776.

The previous prime is 261234397. The next prime is 261234451. The reversal of 261234420 is 24432162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113437 + ... + 115716.

It is an arithmetic number, because the mean of its divisors is an integer number (16040780).

Almost surely, 2^261234420 is an apocalyptic number.

261234420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261234420 is an abundant number, since it is smaller than the sum of its proper divisors (508723020).

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

261234420 is a wasteful number, since it uses less digits than its factorization.

261234420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229184 (or 229182 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 261234420 is about 16162.7479099317. The cubic root of 261234420 is about 639.2589241175.

Adding to 261234420 its reverse (24432162), we get a palindrome (285666582).

The spelling of 261234420 in words is "two hundred sixty-one million, two hundred thirty-four thousand, four hundred twenty".