1540020 has 24 divisors (see below), whose sum is σ = 4312224. Its totient is φ = 410656.

The previous prime is 1540009. The next prime is 1540027. The reversal of 1540020 is 200451.

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

It is a junction number, because it is equal to n+sod(n) for n = 1539978 and 1540005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540027) 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, 12774 + ... + 12893.

It is an arithmetic number, because the mean of its divisors is an integer number (179676).

2^1540020 is an apocalyptic number.

1540020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540020 is an abundant number, since it is smaller than the sum of its proper divisors (2772204).

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

1540020 is a wasteful number, since it uses less digits than its factorization.

1540020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25679 (or 25677 counting only the distinct ones).

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

The square root of 1540020 is about 1240.9754228026. The cubic root of 1540020 is about 115.4805349406.

Adding to 1540020 its reverse (200451), we get a palindrome (1740471).

The spelling of 1540020 in words is "one million, five hundred forty thousand, twenty".