1556240 has 60 divisors (see below), whose sum is σ = 4219596. Its totient is φ = 532224.

The previous prime is 1556201. The next prime is 1556251. The reversal of 1556240 is 426551.

1556240 = T₄₄₈ + T₄₄₉ + ... + T₄₆₂.

It can be written as a sum of positive squares in 2 ways, for example, as 802816 + 753424 = 896^2 + 868^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3722 + ... + 4118.

2^1556240 is an apocalyptic number.

1556240 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 1556240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109798).

1556240 is an abundant number, since it is smaller than the sum of its proper divisors (2663356).

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

1556240 is a wasteful number, since it uses less digits than its factorization.

1556240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1556240 is about 1247.4934869569. The cubic root of 1556240 is about 115.8845462458.

The spelling of 1556240 in words is "one million, five hundred fifty-six thousand, two hundred forty".