1257145426 has 8 divisors (see below), whose sum is σ = 1890421884. Its totient is φ = 627004800.

The previous prime is 1257145397. The next prime is 1257145433. The reversal of 1257145426 is 6245417521.

It can be written as a sum of positive squares in 2 ways, for example, as 694269801 + 562875625 = 26349^2 + 23725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1257145426² = 3160829244225442952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782955 + ... + 784558.

Almost surely, 2^1257145426 is an apocalyptic number.

1257145426 is a deficient number, since it is larger than the sum of its proper divisors (633276458).

1257145426 is a wasteful number, since it uses less digits than its factorization.

1257145426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567916.

The product of its digits is 67200, while the sum is 37.

The square root of 1257145426 is about 35456.2466428696. The cubic root of 1257145426 is about 1079.2660267928.

The spelling of 1257145426 in words is "one billion, two hundred fifty-seven million, one hundred forty-five thousand, four hundred twenty-six".