921142986 has 16 divisors (see below), whose sum is σ = 1843948704. Its totient is φ = 306770544.

The previous prime is 921142973. The next prime is 921142993. The reversal of 921142986 is 689241129.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62020 + ... + 75423.

It is an arithmetic number, because the mean of its divisors is an integer number (115246794).

Almost surely, 2^921142986 is an apocalyptic number.

921142986 is an abundant number, since it is smaller than the sum of its proper divisors (922805718).

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

921142986 is a wasteful number, since it uses less digits than its factorization.

921142986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138565.

The product of its digits is 62208, while the sum is 42.

The square root of 921142986 is about 30350.3374940049. The cubic root of 921142986 is about 972.9914332351.

The spelling of 921142986 in words is "nine hundred twenty-one million, one hundred forty-two thousand, nine hundred eighty-six".