121842890 has 16 divisors (see below), whose sum is σ = 236188008. Its totient is φ = 44988096.

The previous prime is 121842881. The next prime is 121842901. The reversal of 121842890 is 98248121.

It can be written as a sum of positive squares in 4 ways, for example, as 82391929 + 39450961 = 9077^2 + 6281^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121842890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468497 + ... + 468756.

Almost surely, 2^121842890 is an apocalyptic number.

121842890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121842890 is a deficient number, since it is larger than the sum of its proper divisors (114345118).

121842890 is a wasteful number, since it uses less digits than its factorization.

121842890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937273.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 121842890 is about 11038.2466904849. The cubic root of 121842890 is about 495.7545747529.

The spelling of 121842890 in words is "one hundred twenty-one million, eight hundred forty-two thousand, eight hundred ninety".