1542289985 has 8 divisors (see below), whose sum is σ = 1851248616. Its totient is φ = 1233498240.

The previous prime is 1542289961. The next prime is 1542289993. The reversal of 1542289985 is 5899822451.

It is a happy number.

It is a Cunningham number, because it is equal to 39272²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 1542289984 = 1^2 + 39272^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1542289985 - 2⁶ = 1542289921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20396 + ... + 59165.

It is an arithmetic number, because the mean of its divisors is an integer number (231406077).

Almost surely, 2^1542289985 is an apocalyptic number.

It is an amenable number.

1542289985 is a deficient number, since it is larger than the sum of its proper divisors (308958631).

1542289985 is an equidigital number, since it uses as much as digits as its factorization.

1542289985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83443.

The product of its digits is 2073600, while the sum is 53.

The square root of 1542289985 is about 39272.0000127317. Note that the first 4 decimals coincide. The cubic root of 1542289985 is about 1155.3724640969.

The spelling of 1542289985 in words is "one billion, five hundred forty-two million, two hundred eighty-nine thousand, nine hundred eighty-five".