261913984 has 16 divisors (see below), whose sum is σ = 521782020. Its totient is φ = 130956928.

The previous prime is 261913973. The next prime is 261913987. The reversal of 261913984 is 489319162.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 261913984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261913987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1022974 + ... + 1023229.

Almost surely, 2^261913984 is an apocalyptic number.

It is an amenable number.

261913984 is a deficient number, since it is larger than the sum of its proper divisors (259868036).

261913984 is an equidigital number, since it uses as much as digits as its factorization.

261913984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046217 (or 2046205 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 261913984 is about 16183.7567950090. The cubic root of 261913984 is about 639.8127577246.

The spelling of 261913984 in words is "two hundred sixty-one million, nine hundred thirteen thousand, nine hundred eighty-four".