19431408 has 40 divisors (see below), whose sum is σ = 53152848. Its totient is φ = 6095872.

The previous prime is 19431329. The next prime is 19431409. The reversal of 19431408 is 80413491.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19431409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11091 + ... + 12722.

Almost surely, 2^19431408 is an apocalyptic number.

It is an amenable number.

19431408 is an abundant number, since it is smaller than the sum of its proper divisors (33721440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19431408 is a wasteful number, since it uses less digits than its factorization.

19431408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23841 (or 23835 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 19431408 is about 4408.1070767394. The cubic root of 19431408 is about 268.8446655510.

Adding to 19431408 its reverse (80413491), we get a palindrome (99844899).

The spelling of 19431408 in words is "nineteen million, four hundred thirty-one thousand, four hundred eight".