1251463140 has 72 divisors (see below), whose sum is σ = 3800175288. Its totient is φ = 333365760.

The previous prime is 1251463123. The next prime is 1251463153. The reversal of 1251463140 is 413641521.

It is a happy number.

1251463140 is a `hidden beast` number, since 1 + 2 + 514 + 6 + 3 + 140 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 310323456 + 941139684 = 17616^2 + 30678^2 .

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, 193560 + ... + 199920.

Almost surely, 2^1251463140 is an apocalyptic number.

1251463140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251463140 is an abundant number, since it is smaller than the sum of its proper divisors (2548712148).

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

1251463140 is a wasteful number, since it uses less digits than its factorization.

1251463140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7469 (or 7464 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1251463140 is about 35376.0249321486. The cubic root of 1251463140 is about 1077.6374797440.

The spelling of 1251463140 in words is "one billion, two hundred fifty-one million, four hundred sixty-three thousand, one hundred forty".