19974513 has 8 divisors (see below), whose sum is σ = 28681408. Its totient is φ = 12291984.

The previous prime is 19974499. The next prime is 19974517. The reversal of 19974513 is 31547991.

It is a happy number.

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

It is not a de Polignac number, because 19974513 - 2⁴ = 19974497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 512167 = 19974513 / (1 + 9 + 9 + 7 + 4 + 5 + 1 + 3).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19974517) 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, 256045 + ... + 256122.

It is an arithmetic number, because the mean of its divisors is an integer number (3585176).

Almost surely, 2^19974513 is an apocalyptic number.

19974513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19974513 is a deficient number, since it is larger than the sum of its proper divisors (8706895).

19974513 is a wasteful number, since it uses less digits than its factorization.

19974513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512183.

The product of its digits is 34020, while the sum is 39.

The square root of 19974513 is about 4469.2855133679. The cubic root of 19974513 is about 271.3264087093.

The spelling of 19974513 in words is "nineteen million, nine hundred seventy-four thousand, five hundred thirteen".