19499955 has 16 divisors (see below), whose sum is σ = 31256064. Its totient is φ = 10381280.

The previous prime is 19499951. The next prime is 19499959. The reversal of 19499955 is 55999491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19499951) and next prime (19499959).

It is not a de Polignac number, because 19499955 - 2² = 19499951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19499898 and 19499907.

It is not an unprimeable number, because it can be changed into a prime (19499951) 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 15 ways as a sum of consecutive naturals, for example, 12952 + ... + 14378.

It is an arithmetic number, because the mean of its divisors is an integer number (1953504).

Almost surely, 2^19499955 is an apocalyptic number.

19499955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19499955 is a deficient number, since it is larger than the sum of its proper divisors (11756109).

19499955 is a wasteful number, since it uses less digits than its factorization.

19499955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346.

The product of its digits is 656100, while the sum is 51.

The square root of 19499955 is about 4415.8753379143. The cubic root of 19499955 is about 269.1604235576.

The spelling of 19499955 in words is "nineteen million, four hundred ninety-nine thousand, nine hundred fifty-five".