1257945 has 16 divisors (see below), whose sum is σ = 2167872. Its totient is φ = 619200.

The previous prime is 1257931. The next prime is 1257953. The reversal of 1257945 is 5497521.

It is not a de Polignac number, because 1257945 - 2⁸ = 1257689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3031 + ... + 3420.

It is an arithmetic number, because the mean of its divisors is an integer number (135492).

2^1257945 is an apocalyptic number.

1257945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1257945 is a deficient number, since it is larger than the sum of its proper divisors (909927).

1257945 is a wasteful number, since it uses less digits than its factorization.

1257945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472.

The product of its digits is 12600, while the sum is 33.

The square root of 1257945 is about 1121.5814727428. The cubic root of 1257945 is about 107.9494791142.

The spelling of 1257945 in words is "one million, two hundred fifty-seven thousand, nine hundred forty-five".