19993455 has 48 divisors (see below), whose sum is σ = 36088416. Its totient is φ = 10233600.

The previous prime is 19993451. The next prime is 19993469. The reversal of 19993455 is 55439991.

It is a happy number.

19993455 is a `hidden beast` number, since 199 + 9 + 3 + 455 = 666.

It is not a de Polignac number, because 19993455 - 2² = 19993451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19993455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19993451) 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 in 47 ways as a sum of consecutive naturals, for example, 197905 + ... + 198005.

It is an arithmetic number, because the mean of its divisors is an integer number (751842).

Almost surely, 2^19993455 is an apocalyptic number.

19993455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19993455 is a deficient number, since it is larger than the sum of its proper divisors (16094961).

19993455 is a wasteful number, since it uses less digits than its factorization.

19993455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 245 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 19993455 is about 4471.4041418776. The cubic root of 19993455 is about 271.4121486568.

The spelling of 19993455 in words is "nineteen million, nine hundred ninety-three thousand, four hundred fifty-five".