229691918 has 4 divisors (see below), whose sum is σ = 344537880. Its totient is φ = 114845958.

The previous prime is 229691911. The next prime is 229691923. The reversal of 229691918 is 819196922.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229691911) by changing a digit.

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 as a sum of consecutive naturals, namely, 57422978 + ... + 57422981.

It is an arithmetic number, because the mean of its divisors is an integer number (86134470).

Almost surely, 2^229691918 is an apocalyptic number.

229691918 is a deficient number, since it is larger than the sum of its proper divisors (114845962).

229691918 is a wasteful number, since it uses less digits than its factorization.

229691918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114845961.

The product of its digits is 139968, while the sum is 47.

The square root of 229691918 is about 15155.5903217262. The cubic root of 229691918 is about 612.4188807190.

The spelling of 229691918 in words is "two hundred twenty-nine million, six hundred ninety-one thousand, nine hundred eighteen".