920139986 has 4 divisors (see below), whose sum is σ = 1380209982. Its totient is φ = 460069992.

The previous prime is 920139971. The next prime is 920139989. The reversal of 920139986 is 689931029.

920139986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 919605625 + 534361 = 30325^2 + 731^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 920139986.

It is not an unprimeable number, because it can be changed into a prime (920139989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230034995 + ... + 230034998.

Almost surely, 2^920139986 is an apocalyptic number.

920139986 is a deficient number, since it is larger than the sum of its proper divisors (460069996).

920139986 is a wasteful number, since it uses less digits than its factorization.

920139986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460069995.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 920139986 is about 30333.8092893062. The cubic root of 920139986 is about 972.6381529995.

The spelling of 920139986 in words is "nine hundred twenty million, one hundred thirty-nine thousand, nine hundred eighty-six".