1251147740 has 12 divisors (see below), whose sum is σ = 2627410296. Its totient is φ = 500459088.

The previous prime is 1251147731. The next prime is 1251147743. The reversal of 1251147740 is 477411521.

It is a junction number, because it is equal to n+sod(n) for n = 1251147697 and 1251147706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251147743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31278674 + ... + 31278713.

It is an arithmetic number, because the mean of its divisors is an integer number (218950858).

Almost surely, 2^1251147740 is an apocalyptic number.

1251147740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251147740 is an abundant number, since it is smaller than the sum of its proper divisors (1376262556).

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

1251147740 is a wasteful number, since it uses less digits than its factorization.

1251147740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62557396 (or 62557394 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 1251147740 is about 35371.5668298706. The cubic root of 1251147740 is about 1077.5469416083.

The spelling of 1251147740 in words is "one billion, two hundred fifty-one million, one hundred forty-seven thousand, seven hundred forty".