261942424 has 8 divisors (see below), whose sum is σ = 491142060. Its totient is φ = 130971208.

The previous prime is 261942407. The next prime is 261942431. The reversal of 261942424 is 424249162.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×261942424² = 137227666981991552, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261942424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16371394 + ... + 16371409.

Almost surely, 2^261942424 is an apocalyptic number.

It is an amenable number.

261942424 is a deficient number, since it is larger than the sum of its proper divisors (229199636).

261942424 is a wasteful number, since it uses less digits than its factorization.

261942424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32742809 (or 32742805 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 261942424 is about 16184.6354299379. The cubic root of 261942424 is about 639.8359149663.

The spelling of 261942424 in words is "two hundred sixty-one million, nine hundred forty-two thousand, four hundred twenty-four".