1257240 has 32 divisors (see below), whose sum is σ = 3772080. Its totient is φ = 335232.

The previous prime is 1257239. The next prime is 1257241. The reversal of 1257240 is 427521.

It is an interprime number because it is at equal distance from previous prime (1257239) and next prime (1257241).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257241) 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, 5119 + ... + 5358.

2^1257240 is an apocalyptic number.

1257240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257240 is an abundant number, since it is smaller than the sum of its proper divisors (2514840).

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

1257240 is a wasteful number, since it uses less digits than its factorization.

1257240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10491 (or 10487 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 1257240 is about 1121.2671403372. The cubic root of 1257240 is about 107.9293090208.

The spelling of 1257240 in words is "one million, two hundred fifty-seven thousand, two hundred forty".