19997401 has 8 divisors (see below), whose sum is σ = 20619360. Its totient is φ = 19384992.

The previous prime is 19997399. The next prime is 19997413. The reversal of 19997401 is 10479991.

It is a happy number.

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 19997401 - 2¹ = 19997399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19997441) 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, 1986 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (2577420).

Almost surely, 2^19997401 is an apocalyptic number.

It is an amenable number.

19997401 is a deficient number, since it is larger than the sum of its proper divisors (621959).

19997401 is an equidigital number, since it uses as much as digits as its factorization.

19997401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4775.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 19997401 is about 4471.8453685252. The cubic root of 19997401 is about 271.4300031978.

The spelling of 19997401 in words is "nineteen million, nine hundred ninety-seven thousand, four hundred one".