261898242 has 64 divisors (see below), whose sum is σ = 570326400. Its totient is φ = 79902720.

The previous prime is 261898211. The next prime is 261898267. The reversal of 261898242 is 242898162.

It is a junction number, because it is equal to n+sod(n) for n = 261898194 and 261898203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 640134 + ... + 640542.

It is an arithmetic number, because the mean of its divisors is an integer number (8911350).

Almost surely, 2^261898242 is an apocalyptic number.

261898242 is an abundant number, since it is smaller than the sum of its proper divisors (308428158).

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

261898242 is a wasteful number, since it uses less digits than its factorization.

261898242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its digits is 110592, while the sum is 42.

The square root of 261898242 is about 16183.2704358544. The cubic root of 261898242 is about 639.7999390960.

The spelling of 261898242 in words is "two hundred sixty-one million, eight hundred ninety-eight thousand, two hundred forty-two".