19469940 has 96 divisors (see below), whose sum is σ = 62920704. Its totient is φ = 4406400.

The previous prime is 19469911. The next prime is 19469959. The reversal of 19469940 is 4996491.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 19469892 and 19469901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63267 + ... + 63573.

It is an arithmetic number, because the mean of its divisors is an integer number (655424).

Almost surely, 2^19469940 is an apocalyptic number.

19469940 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 19469940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31460352).

19469940 is an abundant number, since it is smaller than the sum of its proper divisors (43450764).

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

19469940 is a wasteful number, since it uses less digits than its factorization.

19469940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 19469940 is about 4412.4754956827. The cubic root of 19469940 is about 269.0222523200.

The spelling of 19469940 in words is "nineteen million, four hundred sixty-nine thousand, nine hundred forty".