1257160422 has 128 divisors (see below), whose sum is σ = 3162931200. Its totient is φ = 325036800.

The previous prime is 1257160397. The next prime is 1257160439. The reversal of 1257160422 is 2240617521.

It is a self number, because there is not a number n which added to its sum of digits gives 1257160422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2201397 + ... + 2201967.

It is an arithmetic number, because the mean of its divisors is an integer number (24710400).

Almost surely, 2^1257160422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1257160422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581465600).

1257160422 is an abundant number, since it is smaller than the sum of its proper divisors (1905770778).

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

1257160422 is a wasteful number, since it uses less digits than its factorization.

1257160422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1257160422 is about 35456.4581141433. The cubic root of 1257160422 is about 1079.2703181576.

Adding to 1257160422 its reverse (2240617521), we get a palindrome (3497777943).

The spelling of 1257160422 in words is "one billion, two hundred fifty-seven million, one hundred sixty thousand, four hundred twenty-two".