1256340 has 24 divisors (see below), whose sum is σ = 3517920. Its totient is φ = 335008.

The previous prime is 1256323. The next prime is 1256347. The reversal of 1256340 is 436521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256347) 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, 10410 + ... + 10529.

It is an arithmetic number, because the mean of its divisors is an integer number (146580).

2^1256340 is an apocalyptic number.

1256340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256340 is an abundant number, since it is smaller than the sum of its proper divisors (2261580).

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

1256340 is a wasteful number, since it uses less digits than its factorization.

1256340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20951 (or 20949 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1256340 is about 1120.8657368302. The cubic root of 1256340 is about 107.9035490053.

It can be divided in two parts, 1256 and 340, that added together give a triangular number (1596 = T₅₆).

The spelling of 1256340 in words is "one million, two hundred fifty-six thousand, three hundred forty".