19863940 has 12 divisors (see below), whose sum is σ = 41714316. Its totient is φ = 7945568.

The previous prime is 19863937. The next prime is 19863953. The reversal of 19863940 is 4936891.

It can be written as a sum of positive squares in 2 ways, for example, as 12068676 + 7795264 = 3474^2 + 2792^2 .

It is a super-2 number, since 2×19863940² = 789152224647200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19863893 and 19863902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496579 + ... + 496618.

It is an arithmetic number, because the mean of its divisors is an integer number (3476193).

Almost surely, 2^19863940 is an apocalyptic number.

19863940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19863940 is an abundant number, since it is smaller than the sum of its proper divisors (21850376).

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

19863940 is a wasteful number, since it uses less digits than its factorization.

19863940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993206 (or 993204 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 19863940 is about 4456.8980244111. The cubic root of 19863940 is about 270.8248210868.

The spelling of 19863940 in words is "nineteen million, eight hundred sixty-three thousand, nine hundred forty".