19397140 has 36 divisors (see below), whose sum is σ = 47386836. Its totient is φ = 6650112.

The previous prime is 19397123. The next prime is 19397173. The reversal of 19397140 is 4179391.

It can be written as a sum of positive squares in 2 ways, for example, as 11478544 + 7918596 = 3388^2 + 2814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19397096 and 19397105.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8917 + ... + 10876.

It is an arithmetic number, because the mean of its divisors is an integer number (1316301).

Almost surely, 2^19397140 is an apocalyptic number.

19397140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19397140 is an abundant number, since it is smaller than the sum of its proper divisors (27989696).

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

19397140 is a wasteful number, since it uses less digits than its factorization.

19397140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19816 (or 19807 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 19397140 is about 4404.2184323669. The cubic root of 19397140 is about 268.6865334178.

Subtracting from 19397140 its sum of digits (34), we obtain a triangular number (19397106 = T₆₂₂₈).

The spelling of 19397140 in words is "nineteen million, three hundred ninety-seven thousand, one hundred forty".