1540840 has 32 divisors (see below), whose sum is σ = 3962880. Its totient is φ = 528192.

The previous prime is 1540831. The next prime is 1540841. The reversal of 1540840 is 480451.

It is not an unprimeable number, because it can be changed into a prime (1540841) 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, 2472 + ... + 3031.

It is an arithmetic number, because the mean of its divisors is an integer number (123840).

2^1540840 is an apocalyptic number.

1540840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540840 is an abundant number, since it is smaller than the sum of its proper divisors (2422040).

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

1540840 is a wasteful number, since it uses less digits than its factorization.

1540840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521 (or 5517 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1540840 is about 1241.3057641049. The cubic root of 1540840 is about 115.5010275828.

The spelling of 1540840 in words is "one million, five hundred forty thousand, eight hundred forty".