19697240 has 16 divisors (see below), whose sum is σ = 44318880. Its totient is φ = 7878880.

The previous prime is 19697233. The next prime is 19697267. The reversal of 19697240 is 4279691.

It is a junction number, because it is equal to n+sod(n) for n = 19697194 and 19697203.

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 3 ways as a sum of consecutive naturals, for example, 246176 + ... + 246255.

It is an arithmetic number, because the mean of its divisors is an integer number (2769930).

Almost surely, 2^19697240 is an apocalyptic number.

19697240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19697240 is an abundant number, since it is smaller than the sum of its proper divisors (24621640).

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

19697240 is a wasteful number, since it uses less digits than its factorization.

19697240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492442 (or 492438 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 19697240 is about 4438.1572752664. The cubic root of 19697240 is about 270.0650963298.

The spelling of 19697240 in words is "nineteen million, six hundred ninety-seven thousand, two hundred forty".