1259440 has 80 divisors (see below), whose sum is σ = 3624768. Its totient is φ = 396288.

The previous prime is 1259429. The next prime is 1259477. The reversal of 1259440 is 449521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1259440² = 3172378227200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 7194 + ... + 7366.

2^1259440 is an apocalyptic number.

1259440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1259440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812384).

1259440 is an abundant number, since it is smaller than the sum of its proper divisors (2365328).

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

1259440 is a wasteful number, since it uses less digits than its factorization.

1259440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1259440 is about 1122.2477444843. The cubic root of 1259440 is about 107.9922262352.

The spelling of 1259440 in words is "one million, two hundred fifty-nine thousand, four hundred forty".