19190640 has 80 divisors (see below), whose sum is σ = 67995648. Its totient is φ = 4386048.

The previous prime is 19190629. The next prime is 19190641. The reversal of 19190640 is 4609191.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 19190598 and 19190607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19190641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4032 + ... + 7391.

Almost surely, 2^19190640 is an apocalyptic number.

19190640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19190640 is an abundant number, since it is smaller than the sum of its proper divisors (48805008).

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

19190640 is a wasteful number, since it uses less digits than its factorization.

19190640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11446 (or 11440 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 19190640 is about 4380.7122708528. The cubic root of 19190640 is about 267.7296598183.

The spelling of 19190640 in words is "nineteen million, one hundred ninety thousand, six hundred forty".