19421249 has 16 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 17706240.

The previous prime is 19421239. The next prime is 19421323. The reversal of 19421249 is 94212491.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19421249 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (19421209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83237 + ... + 83469.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^19421249 is an apocalyptic number.

19421249 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19421249 is a deficient number, since it is larger than the sum of its proper divisors (1807231).

19421249 is a wasteful number, since it uses less digits than its factorization.

19421249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400.

The product of its digits is 5184, while the sum is 32.

The square root of 19421249 is about 4406.9546174201. The cubic root of 19421249 is about 268.7978055214.

The spelling of 19421249 in words is "nineteen million, four hundred twenty-one thousand, two hundred forty-nine".