19944155 has 16 divisors (see below), whose sum is σ = 29839104. Its totient is φ = 12432480.

The previous prime is 19944149. The next prime is 19944187. The reversal of 19944155 is 55144991.

It is not a de Polignac number, because 19944155 - 2⁸ = 19943899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25517 + ... + 26286.

It is an arithmetic number, because the mean of its divisors is an integer number (1864944).

Almost surely, 2^19944155 is an apocalyptic number.

19944155 is a deficient number, since it is larger than the sum of its proper divisors (9894949).

19944155 is a wasteful number, since it uses less digits than its factorization.

19944155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51826.

The product of its digits is 32400, while the sum is 38.

The square root of 19944155 is about 4465.8879296283. The cubic root of 19944155 is about 271.1888817256.

The spelling of 19944155 in words is "nineteen million, nine hundred forty-four thousand, one hundred fifty-five".