1555240 has 32 divisors (see below), whose sum is σ = 3564000. Its totient is φ = 610624.

The previous prime is 1555231. The next prime is 1555243. The reversal of 1555240 is 425551.

It is not an unprimeable number, because it can be changed into a prime (1555243) 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, 2031 + ... + 2689.

It is an arithmetic number, because the mean of its divisors is an integer number (111375).

2^1555240 is an apocalyptic number.

1555240 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 1555240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1782000).

1555240 is an abundant number, since it is smaller than the sum of its proper divisors (2008760).

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

1555240 is a wasteful number, since it uses less digits than its factorization.

1555240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 1555240 is about 1247.0926188539. The cubic root of 1555240 is about 115.8597194460.

It can be divided in two parts, 15 and 55240, that added together give a palindrome (55255).

The spelling of 1555240 in words is "one million, five hundred fifty-five thousand, two hundred forty".