1245440 has 72 divisors (see below), whose sum is σ = 3433920. Its totient is φ = 423936.

The previous prime is 1245421. The next prime is 1245449. The reversal of 1245440 is 445421.

It is a super-2 number, since 2×1245440² = 3102241587200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1245449) 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, 8891 + ... + 9029.

2^1245440 is an apocalyptic number.

1245440 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 1245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1716960).

1245440 is an abundant number, since it is smaller than the sum of its proper divisors (2188480).

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

1245440 is an equidigital number, since it uses as much as digits as its factorization.

1245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1245440 is about 1115.9928315182. The cubic root of 1245440 is about 107.5905852654.

The spelling of 1245440 in words is "one million, two hundred forty-five thousand, four hundred forty".