1540028 has 12 divisors (see below), whose sum is σ = 3080112. Its totient is φ = 660000.

The previous prime is 1540027. The next prime is 1540031. The reversal of 1540028 is 8200451.

1540028 is an admirable number.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1539991 and 1540009.

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 3 ways as a sum of consecutive naturals, for example, 27473 + ... + 27528.

It is an arithmetic number, because the mean of its divisors is an integer number (256676).

2^1540028 is an apocalyptic number.

It is an amenable number.

1540028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1540028 is a wasteful number, since it uses less digits than its factorization.

1540028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55012 (or 55010 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1540028 is about 1240.9786460693. The cubic root of 1540028 is about 115.4807349039.

Adding to 1540028 its reverse (8200451), we get a palindrome (9740479).

The spelling of 1540028 in words is "one million, five hundred forty thousand, twenty-eight".