19979954 has 8 divisors (see below), whose sum is σ = 30380700. Its totient is φ = 9853056.

The previous prime is 19979941. The next prime is 19979959. The reversal of 19979954 is 45997991.

It can be written as a sum of positive squares in 2 ways, for example, as 17833729 + 2146225 = 4223^2 + 1465^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 19979896 and 19979905.

It is not an unprimeable number, because it can be changed into a prime (19979959) 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 3 ways as a sum of consecutive naturals, for example, 68279 + ... + 68570.

Almost surely, 2^19979954 is an apocalyptic number.

19979954 is a deficient number, since it is larger than the sum of its proper divisors (10400746).

19979954 is a wasteful number, since it uses less digits than its factorization.

19979954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136924.

The product of its digits is 918540, while the sum is 53.

The square root of 19979954 is about 4469.8941821927. The cubic root of 19979954 is about 271.3510426509.

The spelling of 19979954 in words is "nineteen million, nine hundred seventy-nine thousand, nine hundred fifty-four".