19419940 has 12 divisors (see below), whose sum is σ = 40781916. Its totient is φ = 7767968.

The previous prime is 19419923. The next prime is 19419941. The reversal of 19419940 is 4991491.

It can be written as a sum of positive squares in 2 ways, for example, as 3211264 + 16208676 = 1792^2 + 4026^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19419940.

It is not an unprimeable number, because it can be changed into a prime (19419941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485479 + ... + 485518.

It is an arithmetic number, because the mean of its divisors is an integer number (3398493).

Almost surely, 2^19419940 is an apocalyptic number.

19419940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19419940 is an abundant number, since it is smaller than the sum of its proper divisors (21361976).

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

19419940 is a wasteful number, since it uses less digits than its factorization.

19419940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971006 (or 971004 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 19419940 is about 4406.8060996599. The cubic root of 19419940 is about 268.7917663590.

It can be divided in two parts, 1941 and 9940, that added together give a square (11881 = 109²).

The spelling of 19419940 in words is "nineteen million, four hundred nineteen thousand, nine hundred forty".