542121986 has 24 divisors (see below), whose sum is σ = 976467456. Its totient is φ = 224841960.

The previous prime is 542121953. The next prime is 542121989. The reversal of 542121986 is 689121245.

It is not an unprimeable number, because it can be changed into a prime (542121989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86186 + ... + 92261.

It is an arithmetic number, because the mean of its divisors is an integer number (40686144).

Almost surely, 2^542121986 is an apocalyptic number.

542121986 is a deficient number, since it is larger than the sum of its proper divisors (434345470).

542121986 is a wasteful number, since it uses less digits than its factorization.

542121986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178494 (or 178487 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 542121986 is about 23283.5131799306. The cubic root of 542121986 is about 815.3905493909.

The spelling of 542121986 in words is "five hundred forty-two million, one hundred twenty-one thousand, nine hundred eighty-six".