542121140 has 72 divisors (see below), whose sum is σ = 1266904800. Its totient is φ = 194687680.

The previous prime is 542121131. The next prime is 542121163. The reversal of 542121140 is 41121245.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199511 + ... + 202209.

It is an arithmetic number, because the mean of its divisors is an integer number (17595900).

Almost surely, 2^542121140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 542121140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (633452400).

542121140 is an abundant number, since it is smaller than the sum of its proper divisors (724783660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

542121140 is a wasteful number, since it uses less digits than its factorization.

542121140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2800 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 542121140 is about 23283.4950125620. The cubic root of 542121140 is about 815.3901252423.

Adding to 542121140 its reverse (41121245), we get a palindrome (583242385).

The spelling of 542121140 in words is "five hundred forty-two million, one hundred twenty-one thousand, one hundred forty".