19453940 has 24 divisors (see below), whose sum is σ = 44567712. Its totient is φ = 7074080.

The previous prime is 19453927. The next prime is 19453943. The reversal of 19453940 is 4935491.

It is a self number, because there is not a number n which added to its sum of digits gives 19453940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19453943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43994 + ... + 44433.

It is an arithmetic number, because the mean of its divisors is an integer number (1856988).

Almost surely, 2^19453940 is an apocalyptic number.

19453940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19453940 is an abundant number, since it is smaller than the sum of its proper divisors (25113772).

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

19453940 is a wasteful number, since it uses less digits than its factorization.

19453940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88447 (or 88445 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 19453940 is about 4410.6620818195. The cubic root of 19453940 is about 268.9485397893.

It can be divided in two parts, 1945 and 3940, that added together give a palindrome (5885).

The spelling of 19453940 in words is "nineteen million, four hundred fifty-three thousand, nine hundred forty".