1542391 has 4 divisors (see below), whose sum is σ = 1545784. Its totient is φ = 1539000.

The previous prime is 1542383. The next prime is 1542421. The reversal of 1542391 is 1932451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1932451 = 227 ⋅8513.

It is a cyclic number.

It is not a de Polignac number, because 1542391 - 2³ = 1542383 is a prime.

It is a Duffinian number.

1542391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885 + ... + 1966.

It is an arithmetic number, because the mean of its divisors is an integer number (386446).

2^1542391 is an apocalyptic number.

1542391 is a deficient number, since it is larger than the sum of its proper divisors (3393).

1542391 is an equidigital number, since it uses as much as digits as its factorization.

1542391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392.

The product of its digits is 1080, while the sum is 25.

The square root of 1542391 is about 1241.9303523145. The cubic root of 1542391 is about 115.5397687931.

The spelling of 1542391 in words is "one million, five hundred forty-two thousand, three hundred ninety-one".