1255366640 has 40 divisors (see below), whose sum is σ = 3184068528. Its totient is φ = 456496640.

The previous prime is 1255366631. The next prime is 1255366667. The reversal of 1255366640 is 466635521.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1255366594 and 1255366603.

It is a congruent number.

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, 712397 + ... + 714156.

Almost surely, 2^1255366640 is an apocalyptic number.

1255366640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255366640 is an abundant number, since it is smaller than the sum of its proper divisors (1928701888).

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

1255366640 is a wasteful number, since it uses less digits than its factorization.

1255366640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426577 (or 1426571 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 1255366640 is about 35431.1535234178. The cubic root of 1255366640 is about 1078.7567541101.

The spelling of 1255366640 in words is "one billion, two hundred fifty-five million, three hundred sixty-six thousand, six hundred forty".