19369840 has 40 divisors (see below), whose sum is σ = 51469920. Its totient is φ = 6640896.

The previous prime is 19369813. The next prime is 19369843. The reversal of 19369840 is 4896391.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 19369793 and 19369802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19369843) 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 7 ways as a sum of consecutive naturals, for example, 16735 + ... + 17854.

It is an arithmetic number, because the mean of its divisors is an integer number (1286748).

Almost surely, 2^19369840 is an apocalyptic number.

19369840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19369840 is an abundant number, since it is smaller than the sum of its proper divisors (32100080).

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

19369840 is a wasteful number, since it uses less digits than its factorization.

19369840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34609 (or 34603 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 19369840 is about 4401.1180397713. The cubic root of 19369840 is about 268.5604222785.

The spelling of 19369840 in words is "nineteen million, three hundred sixty-nine thousand, eight hundred forty".