19697090 has 64 divisors (see below), whose sum is σ = 43407360. Its totient is φ = 6289920.

The previous prime is 19697087. The next prime is 19697099. The reversal of 19697090 is 9079691.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19697099) 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 31 ways as a sum of consecutive naturals, for example, 62774 + ... + 63086.

It is an arithmetic number, because the mean of its divisors is an integer number (678240).

Almost surely, 2^19697090 is an apocalyptic number.

19697090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19697090 is an abundant number, since it is smaller than the sum of its proper divisors (23710270).

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

19697090 is a wasteful number, since it uses less digits than its factorization.

19697090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 19697090 is about 4438.1403763288. The cubic root of 19697090 is about 270.0644107876.

The spelling of 19697090 in words is "nineteen million, six hundred ninety-seven thousand, ninety".