1257425 has 24 divisors (see below), whose sum is σ = 1734264. Its totient is φ = 898560.

The previous prime is 1257409. The next prime is 1257437. The reversal of 1257425 is 5247521.

It can be written as a sum of positive squares in 12 ways, for example, as 379456 + 877969 = 616^2 + 937^2 .

It is not a de Polignac number, because 1257425 - 2⁴ = 1257409 is a prime.

It is a super-2 number, since 2×1257425² = 3162235261250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1257394 and 1257403.

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, 17189 + ... + 17261.

It is an arithmetic number, because the mean of its divisors is an integer number (72261).

2^1257425 is an apocalyptic number.

It is an amenable number.

1257425 is a deficient number, since it is larger than the sum of its proper divisors (476839).

1257425 is a wasteful number, since it uses less digits than its factorization.

1257425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 144 counting only the distinct ones).

The product of its digits is 2800, while the sum is 26.

The square root of 1257425 is about 1121.3496332545. The cubic root of 1257425 is about 107.9346026118.

The spelling of 1257425 in words is "one million, two hundred fifty-seven thousand, four hundred twenty-five".