1257978 has 16 divisors (see below), whose sum is σ = 2552256. Its totient is φ = 413280.

The previous prime is 1257973. The next prime is 1257989. The reversal of 1257978 is 8797521.

It is not an unprimeable number, because it can be changed into a prime (1257973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051 + ... + 1902.

It is an arithmetic number, because the mean of its divisors is an integer number (159516).

2^1257978 is an apocalyptic number.

1257978 is an abundant number, since it is smaller than the sum of its proper divisors (1294278).

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

1257978 is a wasteful number, since it uses less digits than its factorization.

1257978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029.

The product of its digits is 35280, while the sum is 39.

The square root of 1257978 is about 1121.5961840163. The cubic root of 1257978 is about 107.9504230616.

The spelling of 1257978 in words is "one million, two hundred fifty-seven thousand, nine hundred seventy-eight".