1257140 has 24 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 498848.

The previous prime is 1257131. The next prime is 1257163. The reversal of 1257140 is 417521.

1257140 is nontrivially palindromic in base 8.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4649 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (110880).

2^1257140 is an apocalyptic number.

1257140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257140 is an abundant number, since it is smaller than the sum of its proper divisors (1403980).

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

1257140 is a wasteful number, since it uses less digits than its factorization.

1257140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1257140 is about 1121.2225470441. Note that the first 3 decimals coincide. The cubic root of 1257140 is about 107.9264474041.

The spelling of 1257140 in words is "one million, two hundred fifty-seven thousand, one hundred forty".