19223740 has 12 divisors (see below), whose sum is σ = 40369896. Its totient is φ = 7689488.

The previous prime is 19223717. The next prime is 19223749. The reversal of 19223740 is 4732291.

It is a junction number, because it is equal to n+sod(n) for n = 19223699 and 19223708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19223749) 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, 480574 + ... + 480613.

It is an arithmetic number, because the mean of its divisors is an integer number (3364158).

Almost surely, 2^19223740 is an apocalyptic number.

19223740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19223740 is an abundant number, since it is smaller than the sum of its proper divisors (21146156).

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

19223740 is a wasteful number, since it uses less digits than its factorization.

19223740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961196 (or 961194 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 19223740 is about 4384.4885676667. The cubic root of 19223740 is about 267.8834980374.

It can be divided in two parts, 192 and 23740, that added together give a palindrome (23932).

The spelling of 19223740 in words is "nineteen million, two hundred twenty-three thousand, seven hundred forty".