1520040 has 64 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 396032.

The previous prime is 1520011. The next prime is 1520069. The reversal of 1520040 is 400251.

It is an interprime number because it is at equal distance from previous prime (1520011) and next prime (1520069).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1519998 and 1520025.

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, 6241 + ... + 6479.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2^1520040 is an apocalyptic number.

1520040 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 1520040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332800).

1520040 is an abundant number, since it is smaller than the sum of its proper divisors (3145560).

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

1520040 is a wasteful number, since it uses less digits than its factorization.

1520040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 1520040 is about 1232.8990226292. The cubic root of 1520040 is about 114.9789501485.

Adding to 1520040 its reverse (400251), we get a palindrome (1920291).

The spelling of 1520040 in words is "one million, five hundred twenty thousand, forty".