19653940 has 12 divisors (see below), whose sum is σ = 41273316. Its totient is φ = 7861568.

The previous prime is 19653917. The next prime is 19653941. The reversal of 19653940 is 4935691.

It can be written as a sum of positive squares in 2 ways, for example, as 8444836 + 11209104 = 2906^2 + 3348^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19653940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19653941) 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 3 ways as a sum of consecutive naturals, for example, 491329 + ... + 491368.

It is an arithmetic number, because the mean of its divisors is an integer number (3439443).

Almost surely, 2^19653940 is an apocalyptic number.

19653940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19653940 is an abundant number, since it is smaller than the sum of its proper divisors (21619376).

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

19653940 is a wasteful number, since it uses less digits than its factorization.

19653940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982706 (or 982704 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 19653940 is about 4433.2764407377. The cubic root of 19653940 is about 269.8670584676.

The spelling of 19653940 in words is "nineteen million, six hundred fifty-three thousand, nine hundred forty".