19949943 has 36 divisors (see below), whose sum is σ = 30678120. Its totient is φ = 11524032.

The previous prime is 19949939. The next prime is 19949953. The reversal of 19949943 is 34994991.

It is not a de Polignac number, because 19949943 - 2² = 19949939 is a prime.

Its product of digits (314928) is a multiple of the sum of its prime divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 19949892 and 19949901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949933) 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 35 ways as a sum of consecutive naturals, for example, 182973 + ... + 183081.

It is an arithmetic number, because the mean of its divisors is an integer number (852170).

Almost surely, 2^19949943 is an apocalyptic number.

19949943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19949943 is a deficient number, since it is larger than the sum of its proper divisors (10728177).

19949943 is a wasteful number, since it uses less digits than its factorization.

19949943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 144 counting only the distinct ones).

The product of its digits is 314928, while the sum is 48.

The square root of 19949943 is about 4466.5359060462. The cubic root of 19949943 is about 271.2151131274.

The spelling of 19949943 in words is "nineteen million, nine hundred forty-nine thousand, nine hundred forty-three".