542121990 has 16 divisors (see below), whose sum is σ = 1301092848. Its totient is φ = 144565856.

The previous prime is 542121989. The next prime is 542121997. The reversal of 542121990 is 99121245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542121997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9035337 + ... + 9035396.

It is an arithmetic number, because the mean of its divisors is an integer number (81318303).

Almost surely, 2^542121990 is an apocalyptic number.

542121990 is an abundant number, since it is smaller than the sum of its proper divisors (758970858).

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

542121990 is a wasteful number, since it uses less digits than its factorization.

542121990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18070743.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 542121990 is about 23283.5132658282. The cubic root of 542121990 is about 815.3905513963.

The spelling of 542121990 in words is "five hundred forty-two million, one hundred twenty-one thousand, nine hundred ninety".