19430940 has 48 divisors (see below), whose sum is σ = 55308960. Its totient is φ = 5095680.

The previous prime is 19430923. The next prime is 19430947. The reversal of 19430940 is 4903491.

It is a super-2 number, since 2×19430940² = 755122858567200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 19430898 and 19430907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19430947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1006 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (1152270).

Almost surely, 2^19430940 is an apocalyptic number.

19430940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19430940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27654480).

19430940 is an abundant number, since it is smaller than the sum of its proper divisors (35878020).

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

19430940 is a wasteful number, since it uses less digits than its factorization.

19430940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382 (or 5380 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 19430940 is about 4408.0539924098. The cubic root of 19430940 is about 268.8425071843.

The spelling of 19430940 in words is "nineteen million, four hundred thirty thousand, nine hundred forty".