1520240 has 40 divisors (see below), whose sum is σ = 3654528. Its totient is φ = 587520.

The previous prime is 1520227. The next prime is 1520251. The reversal of 1520240 is 420251.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1520240² = 4622259315200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2174 + ... + 2786.

2^1520240 is an apocalyptic number.

1520240 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 1520240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1827264).

1520240 is an abundant number, since it is smaller than the sum of its proper divisors (2134288).

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

1520240 is a wasteful number, since it uses less digits than its factorization.

1520240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1520240 is about 1232.9801296047. The cubic root of 1520240 is about 114.9839927310.

Adding to 1520240 its reverse (420251), we get a palindrome (1940491).

The spelling of 1520240 in words is "one million, five hundred twenty thousand, two hundred forty".