1257668 has 12 divisors (see below), whose sum is σ = 2212140. Its totient is φ = 625632.

The previous prime is 1257653. The next prime is 1257689. The reversal of 1257668 is 8667521.

It can be written as a sum of positive squares in 2 ways, for example, as 1214404 + 43264 = 1102^2 + 208^2 .

It is an Ulam number.

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, 230 + ... + 1602.

It is an arithmetic number, because the mean of its divisors is an integer number (184345).

2^1257668 is an apocalyptic number.

It is an amenable number.

1257668 is a deficient number, since it is larger than the sum of its proper divisors (954472).

1257668 is a wasteful number, since it uses less digits than its factorization.

1257668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1604 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 1257668 is about 1121.4579795962. The cubic root of 1257668 is about 107.9415550262.

The spelling of 1257668 in words is "one million, two hundred fifty-seven thousand, six hundred sixty-eight".