1455440 has 80 divisors (see below), whose sum is σ = 4071168. Its totient is φ = 473088.

The previous prime is 1455439. The next prime is 1455491. The reversal of 1455440 is 445541.

1455440 = T₄₃₃ + T₄₃₄ + ... + T₄₄₇.

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

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12824 + ... + 12936.

2^1455440 is an apocalyptic number.

1455440 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 1455440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035584).

1455440 is an abundant number, since it is smaller than the sum of its proper divisors (2615728).

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

1455440 is a wasteful number, since it uses less digits than its factorization.

1455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1455440 is about 1206.4161802628. The cubic root of 1455440 is about 113.3264893983.

The spelling of 1455440 in words is "one million, four hundred fifty-five thousand, four hundred forty".