1255947840 has 168 divisors, whose sum is σ = 4937150400. Its totient is φ = 287069184.

The previous prime is 1255947839. The next prime is 1255947887. The reversal of 1255947840 is 487495521.

1255947840 is a `hidden beast` number, since 12 + 5 + 594 + 7 + 8 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10990 + ... + 51309.

It is an arithmetic number, because the mean of its divisors is an integer number (29387800).

Almost surely, 2^1255947840 is an apocalyptic number.

1255947840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255947840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2468575200).

1255947840 is an abundant number, since it is smaller than the sum of its proper divisors (3681202560).

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

1255947840 is a wasteful number, since it uses less digits than its factorization.

1255947840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62329 (or 62316 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 1255947840 is about 35439.3543959254. The cubic root of 1255947840 is about 1078.9232065959.

The spelling of 1255947840 in words is "one billion, two hundred fifty-five million, nine hundred forty-seven thousand, eight hundred forty".