1251964944 has 160 divisors (see below), whose sum is σ = 3700477440. Its totient is φ = 405070848.

The previous prime is 1251964867. The next prime is 1251964981. The reversal of 1251964944 is 4494691521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251964944.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3999732 + ... + 4000044.

It is an arithmetic number, because the mean of its divisors is an integer number (23127984).

Almost surely, 2^1251964944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251964944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1850238720).

1251964944 is an abundant number, since it is smaller than the sum of its proper divisors (2448512496).

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

1251964944 is a wasteful number, since it uses less digits than its factorization.

1251964944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 562 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 1251964944 is about 35383.1166518723. The cubic root of 1251964944 is about 1077.7814953151.

The spelling of 1251964944 in words is "one billion, two hundred fifty-one million, nine hundred sixty-four thousand, nine hundred forty-four".