1540539 has 80 divisors (see below), whose sum is σ = 3252480. Its totient is φ = 699840.

The previous prime is 1540499. The next prime is 1540541. The reversal of 1540539 is 9350451.

It is not a de Polignac number, because 1540539 - 2⁹ = 1540027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1540559) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 81072 + ... + 81090.

It is an arithmetic number, because the mean of its divisors is an integer number (40656).

2^1540539 is an apocalyptic number.

1540539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1540539 is an abundant number, since it is smaller than the sum of its proper divisors (1711941).

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

1540539 is a wasteful number, since it uses less digits than its factorization.

1540539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1540539 is about 1241.1845148889. The cubic root of 1540539 is about 115.4935061284.

The spelling of 1540539 in words is "one million, five hundred forty thousand, five hundred thirty-nine".