1542434818 has 4 divisors (see below), whose sum is σ = 2313652230. Its totient is φ = 771217408.

The previous prime is 1542434807. The next prime is 1542434819. The reversal of 1542434818 is 8184342451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8184342451 = 199 ⋅41127349.

It can be written as a sum of positive squares in only one way, i.e., 1516557249 + 25877569 = 38943^2 + 5087^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1542434819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385608703 + ... + 385608706.

Almost surely, 2^1542434818 is an apocalyptic number.

1542434818 is a deficient number, since it is larger than the sum of its proper divisors (771217412).

1542434818 is an equidigital number, since it uses as much as digits as its factorization.

1542434818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771217411.

The product of its digits is 122880, while the sum is 40.

The square root of 1542434818 is about 39273.8439422474. The cubic root of 1542434818 is about 1155.4086291121.

The spelling of 1542434818 in words is "one billion, five hundred forty-two million, four hundred thirty-four thousand, eight hundred eighteen".