19944940 has 12 divisors (see below), whose sum is σ = 41884416. Its totient is φ = 7977968.

The previous prime is 19944937. The next prime is 19944943. The reversal of 19944940 is 4944991.

It is an interprime number because it is at equal distance from previous prime (19944937) and next prime (19944943).

It is a junction number, because it is equal to n+sod(n) for n = 19944893 and 19944902.

It is not an unprimeable number, because it can be changed into a prime (19944943) 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, 498604 + ... + 498643.

It is an arithmetic number, because the mean of its divisors is an integer number (3490368).

Almost surely, 2^19944940 is an apocalyptic number.

19944940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19944940 is an abundant number, since it is smaller than the sum of its proper divisors (21939476).

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

19944940 is a wasteful number, since it uses less digits than its factorization.

19944940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997256 (or 997254 counting only the distinct ones).

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

The square root of 19944940 is about 4465.9758172207. The cubic root of 19944940 is about 271.1924396682.

The spelling of 19944940 in words is "nineteen million, nine hundred forty-four thousand, nine hundred forty".