920678387 has 4 divisors (see below), whose sum is σ = 920955840. Its totient is φ = 920400936.

The previous prime is 920678357. The next prime is 920678417. The reversal of 920678387 is 783876029.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783876029 = 11689 ⋅67061.

It is an interprime number because it is at equal distance from previous prime (920678357) and next prime (920678417).

It is a cyclic number.

It is not a de Polignac number, because 920678387 - 2⁶ = 920678323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920678357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133688 + ... + 140405.

It is an arithmetic number, because the mean of its divisors is an integer number (230238960).

Almost surely, 2^920678387 is an apocalyptic number.

920678387 is a deficient number, since it is larger than the sum of its proper divisors (277453).

920678387 is a wasteful number, since it uses less digits than its factorization.

920678387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277452.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 920678387 is about 30342.6825939962. The cubic root of 920678387 is about 972.8278224184.

The spelling of 920678387 in words is "nine hundred twenty million, six hundred seventy-eight thousand, three hundred eighty-seven".