1542421243 has 12 divisors (see below), whose sum is σ = 1696744840. Its totient is φ = 1401079680.

The previous prime is 1542421229. The next prime is 1542421249. The reversal of 1542421243 is 3421242451.

It is not a de Polignac number, because 1542421243 - 2²⁵ = 1508866811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1542421249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172171 + ... + 180907.

Almost surely, 2^1542421243 is an apocalyptic number.

1542421243 is a deficient number, since it is larger than the sum of its proper divisors (154323597).

1542421243 is a wasteful number, since it uses less digits than its factorization.

1542421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218 (or 10207 counting only the distinct ones).

The product of its digits is 7680, while the sum is 28.

The square root of 1542421243 is about 39273.6711169200. The cubic root of 1542421243 is about 1155.4052395106.

Adding to 1542421243 its reverse (3421242451), we get a palindrome (4963663694).

The spelling of 1542421243 in words is "one billion, five hundred forty-two million, four hundred twenty-one thousand, two hundred forty-three".