919230639 has 4 divisors (see below), whose sum is σ = 1225640856. Its totient is φ = 612820424.

The previous prime is 919230623. The next prime is 919230643. The reversal of 919230639 is 936032919.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 919230639 - 2⁴ = 919230623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 919230639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919210639) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 153205104 + ... + 153205109.

It is an arithmetic number, because the mean of its divisors is an integer number (306410214).

Almost surely, 2^919230639 is an apocalyptic number.

919230639 is a deficient number, since it is larger than the sum of its proper divisors (306410217).

919230639 is a wasteful number, since it uses less digits than its factorization.

919230639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306410216.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 919230639 is about 30318.8165831056. The cubic root of 919230639 is about 972.3176375983.

The spelling of 919230639 in words is "nine hundred nineteen million, two hundred thirty thousand, six hundred thirty-nine".