261299740 has 48 divisors (see below), whose sum is σ = 592153632. Its totient is φ = 96281856.

The previous prime is 261299693. The next prime is 261299767. The reversal of 261299740 is 47992162.

It is a junction number, because it is equal to n+sod(n) for n = 261299693 and 261299702.

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, 203982 + ... + 205258.

It is an arithmetic number, because the mean of its divisors is an integer number (12336534).

Almost surely, 2^261299740 is an apocalyptic number.

261299740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261299740 is an abundant number, since it is smaller than the sum of its proper divisors (330853892).

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

261299740 is a wasteful number, since it uses less digits than its factorization.

261299740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086 (or 2084 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 261299740 is about 16164.7684796288. The cubic root of 261299740 is about 639.3122005490.

The spelling of 261299740 in words is "two hundred sixty-one million, two hundred ninety-nine thousand, seven hundred forty".