19945158 has 8 divisors (see below), whose sum is σ = 39890328. Its totient is φ = 6648384.

The previous prime is 19945153. The next prime is 19945171. The reversal of 19945158 is 85154991.

It is a sphenic number, since it is the product of 3 distinct primes.

19945158 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19945151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662091 + ... + 1662102.

It is an arithmetic number, because the mean of its divisors is an integer number (4986291).

Almost surely, 2^19945158 is an apocalyptic number.

19945158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19945158 is a wasteful number, since it uses less digits than its factorization.

19945158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324198.

The product of its digits is 64800, while the sum is 42.

The square root of 19945158 is about 4466.0002239140. Note that the first 3 decimals coincide. The cubic root of 19945158 is about 271.1934277173.

The spelling of 19945158 in words is "nineteen million, nine hundred forty-five thousand, one hundred fifty-eight".