19894940 has 24 divisors (see below), whose sum is σ = 44993760. Its totient is φ = 7345728.

The previous prime is 19894933. The next prime is 19894943. The reversal of 19894940 is 4949891.

It is a junction number, because it is equal to n+sod(n) for n = 19894891 and 19894900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19894943) 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 7 ways as a sum of consecutive naturals, for example, 38000 + ... + 38519.

It is an arithmetic number, because the mean of its divisors is an integer number (1874740).

Almost surely, 2^19894940 is an apocalyptic number.

19894940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19894940 is an abundant number, since it is smaller than the sum of its proper divisors (25098820).

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

19894940 is a wasteful number, since it uses less digits than its factorization.

19894940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76541 (or 76539 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 19894940 is about 4460.3744237452. The cubic root of 19894940 is about 270.9656324568.

The spelling of 19894940 in words is "nineteen million, eight hundred ninety-four thousand, nine hundred forty".