19779954 has 16 divisors (see below), whose sum is σ = 41280192. Its totient is φ = 6306608.

The previous prime is 19779937. The next prime is 19779973. The reversal of 19779954 is 45997791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19779897 and 19779906.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 71529 + ... + 71804.

It is an arithmetic number, because the mean of its divisors is an integer number (2580012).

Almost surely, 2^19779954 is an apocalyptic number.

19779954 is an abundant number, since it is smaller than the sum of its proper divisors (21500238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19779954 is a wasteful number, since it uses less digits than its factorization.

19779954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143361.

The product of its digits is 714420, while the sum is 51.

The square root of 19779954 is about 4447.4660201063. The cubic root of 19779954 is about 270.4425937040.

The spelling of 19779954 in words is "nineteen million, seven hundred seventy-nine thousand, nine hundred fifty-four".