261426940 has 12 divisors (see below), whose sum is σ = 548996616. Its totient is φ = 104570768.

The previous prime is 261426923. The next prime is 261426953. The reversal of 261426940 is 49624162.

It is a junction number, because it is equal to n+sod(n) for n = 261426896 and 261426905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6535654 + ... + 6535693.

It is an arithmetic number, because the mean of its divisors is an integer number (45749718).

Almost surely, 2^261426940 is an apocalyptic number.

261426940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261426940 is an abundant number, since it is smaller than the sum of its proper divisors (287569676).

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

261426940 is a wasteful number, since it uses less digits than its factorization.

261426940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13071356 (or 13071354 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 261426940 is about 16168.7024835019. The cubic root of 261426940 is about 639.4159221983.

The spelling of 261426940 in words is "two hundred sixty-one million, four hundred twenty-six thousand, nine hundred forty".