1542027391 has 4 divisors (see below), whose sum is σ = 1542270384. Its totient is φ = 1541784400.

The previous prime is 1542027367. The next prime is 1542027407. The reversal of 1542027391 is 1937202451.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1542027391 - 2⁵ = 1542027359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542027491) 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, 111715 + ... + 124756.

It is an arithmetic number, because the mean of its divisors is an integer number (385567596).

Almost surely, 2^1542027391 is an apocalyptic number.

1542027391 is a deficient number, since it is larger than the sum of its proper divisors (242993).

1542027391 is an equidigital number, since it uses as much as digits as its factorization.

1542027391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242992.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1542027391 is about 39268.6565978517. The cubic root of 1542027391 is about 1155.3068882108.

The spelling of 1542027391 in words is "one billion, five hundred forty-two million, twenty-seven thousand, three hundred ninety-one".