259515440 has 40 divisors (see below), whose sum is σ = 629611488. Its totient is φ = 99292160.

The previous prime is 259515439. The next prime is 259515467. The reversal of 259515440 is 44515952.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 259515440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68681 + ... + 72360.

Almost surely, 2^259515440 is an apocalyptic number.

259515440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

259515440 is an abundant number, since it is smaller than the sum of its proper divisors (370096048).

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

259515440 is a wasteful number, since it uses less digits than its factorization.

259515440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141077 (or 141071 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 259515440 is about 16109.4829215590. The cubic root of 259515440 is about 637.8536825066.

The spelling of 259515440 in words is "two hundred fifty-nine million, five hundred fifteen thousand, four hundred forty".