1356978542 has 4 divisors (see below), whose sum is σ = 2035467816. Its totient is φ = 678489270.

The previous prime is 1356978521. The next prime is 1356978619. The reversal of 1356978542 is 2458796531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2458796531 = 23 ⋅106904197.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339244634 + ... + 339244637.

It is an arithmetic number, because the mean of its divisors is an integer number (508866954).

Almost surely, 2^1356978542 is an apocalyptic number.

1356978542 is a deficient number, since it is larger than the sum of its proper divisors (678489274).

1356978542 is an equidigital number, since it uses as much as digits as its factorization.

1356978542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678489273.

The product of its digits is 1814400, while the sum is 50.

The square root of 1356978542 is about 36837.1896593646. The cubic root of 1356978542 is about 1107.1105604025.

The spelling of 1356978542 in words is "one billion, three hundred fifty-six million, nine hundred seventy-eight thousand, five hundred forty-two".