1251342630 has 48 divisors (see below), whose sum is σ = 3444876864. Its totient is φ = 314062080.

The previous prime is 1251342529. The next prime is 1251342649. The reversal of 1251342630 is 362431521.

1251342630 is a `hidden beast` number, since 1 + 25 + 1 + 3 + 4 + 2 + 630 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1251342594 and 1251342603.

It is a congruent number.

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, 407406 + ... + 410465.

It is an arithmetic number, because the mean of its divisors is an integer number (71768268).

Almost surely, 2^1251342630 is an apocalyptic number.

1251342630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251342630 is an abundant number, since it is smaller than the sum of its proper divisors (2193534234).

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

1251342630 is a wasteful number, since it uses less digits than its factorization.

1251342630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817901 (or 817898 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1251342630 is about 35374.3216189371. The cubic root of 1251342630 is about 1077.6028881641.

The spelling of 1251342630 in words is "one billion, two hundred fifty-one million, three hundred forty-two thousand, six hundred thirty".