1428440 has 64 divisors (see below), whose sum is σ = 3598560. Its totient is φ = 506880.

The previous prime is 1428431. The next prime is 1428473. The reversal of 1428440 is 448241.

1428440 = T₁₁₁ + T₁₁₂ + ... + T₂₁₄.

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, 21287 + ... + 21353.

2^1428440 is an apocalyptic number.

1428440 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 1428440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799280).

1428440 is an abundant number, since it is smaller than the sum of its proper divisors (2170120).

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

1428440 is a wasteful number, since it uses less digits than its factorization.

1428440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 1428440 is about 1195.1736275538. The cubic root of 1428440 is about 112.6213341116.

The spelling of 1428440 in words is "one million, four hundred twenty-eight thousand, four hundred forty".