1540039 has 2 divisors, whose sum is σ = 1540040. Its totient is φ = 1540038.

The previous prime is 1540031. The next prime is 1540073. The reversal of 1540039 is 9300451.

It is a weak prime.

It is an emirp because it is prime and its reverse (9300451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540039 - 2³ = 1540031 is a prime.

It is a Chen prime.

1540039 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770019 + 770020.

It is an arithmetic number, because the mean of its divisors is an integer number (770020).

2^1540039 is an apocalyptic number.

1540039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540039 is an equidigital number, since it uses as much as digits as its factorization.

1540039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1540039 is about 1240.9830780474. The cubic root of 1540039 is about 115.4810098524.

The spelling of 1540039 in words is "one million, five hundred forty thousand, thirty-nine".