19671993 has 24 divisors (see below), whose sum is σ = 31299840. Its totient is φ = 11806560.

The previous prime is 19671983. The next prime is 19671997. The reversal of 19671993 is 39917691.

It is not a de Polignac number, because 19671993 - 2⁶ = 19671929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19671997) 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 23 ways as a sum of consecutive naturals, for example, 9880 + ... + 11702.

It is an arithmetic number, because the mean of its divisors is an integer number (1304160).

Almost surely, 2^19671993 is an apocalyptic number.

It is an amenable number.

19671993 is a deficient number, since it is larger than the sum of its proper divisors (11627847).

19671993 is a wasteful number, since it uses less digits than its factorization.

19671993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949 (or 1946 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 19671993 is about 4435.3120521560. The cubic root of 19671993 is about 269.9496613974.

The spelling of 19671993 in words is "nineteen million, six hundred seventy-one thousand, nine hundred ninety-three".