19440497 has 8 divisors (see below), whose sum is σ = 20379840. Its totient is φ = 18509040.

The previous prime is 19440493. The next prime is 19440511. The reversal of 19440497 is 79404491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19440497 - 2² = 19440493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19440497.

It is not an unprimeable number, because it can be changed into a prime (19440493) 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 7 ways as a sum of consecutive naturals, for example, 3422 + ... + 7112.

It is an arithmetic number, because the mean of its divisors is an integer number (2547480).

Almost surely, 2^19440497 is an apocalyptic number.

It is an amenable number.

19440497 is a deficient number, since it is larger than the sum of its proper divisors (939343).

19440497 is a wasteful number, since it uses less digits than its factorization.

19440497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 19440497 is about 4409.1378975940. The cubic root of 19440497 is about 268.8865761918.

The spelling of 19440497 in words is "nineteen million, four hundred forty thousand, four hundred ninety-seven".