19943397 has 12 divisors (see below), whose sum is σ = 30501900. Its totient is φ = 12513408.

The previous prime is 19943389. The next prime is 19943411. The reversal of 19943397 is 79334991.

It can be written as a sum of positive squares in 2 ways, for example, as 9696996 + 10246401 = 3114^2 + 3201^2 .

It is not a de Polignac number, because 19943397 - 2³ = 19943389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19943347) 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 11 ways as a sum of consecutive naturals, for example, 65022 + ... + 65327.

It is an arithmetic number, because the mean of its divisors is an integer number (2541825).

Almost surely, 2^19943397 is an apocalyptic number.

19943397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19943397 is a deficient number, since it is larger than the sum of its proper divisors (10558503).

19943397 is a wasteful number, since it uses less digits than its factorization.

19943397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130372 (or 130369 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 19943397 is about 4465.8030632799. The cubic root of 19943397 is about 271.1854460694.

The spelling of 19943397 in words is "nineteen million, nine hundred forty-three thousand, three hundred ninety-seven".