542423909 has 4 divisors (see below), whose sum is σ = 543225804. Its totient is φ = 541622016.

The previous prime is 542423873. The next prime is 542423929. The reversal of 542423909 is 909324245.

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: 909324245 = 5 ⋅181864849.

It can be written as a sum of positive squares in 2 ways, for example, as 270503809 + 271920100 = 16447^2 + 16490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542423909 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 (542423929) 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, 399932 + ... + 401285.

It is an arithmetic number, because the mean of its divisors is an integer number (135806451).

Almost surely, 2^542423909 is an apocalyptic number.

It is an amenable number.

542423909 is a deficient number, since it is larger than the sum of its proper divisors (801895).

542423909 is an equidigital number, since it uses as much as digits as its factorization.

542423909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801894.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 542423909 is about 23289.9958995273. The cubic root of 542423909 is about 815.5418926179.

The spelling of 542423909 in words is "five hundred forty-two million, four hundred twenty-three thousand, nine hundred nine".