19491912 has 48 divisors (see below), whose sum is σ = 57592080. Its totient is φ = 5906400.

The previous prime is 19491893. The next prime is 19491917. The reversal of 19491912 is 21919491.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (19491917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11514 + ... + 13097.

It is an arithmetic number, because the mean of its divisors is an integer number (1199835).

Almost surely, 2^19491912 is an apocalyptic number.

19491912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19491912 is an abundant number, since it is smaller than the sum of its proper divisors (38100168).

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

19491912 is a wasteful number, since it uses less digits than its factorization.

19491912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24634 (or 24627 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 19491912 is about 4414.9645525191. The cubic root of 19491912 is about 269.1234122756.

The spelling of 19491912 in words is "nineteen million, four hundred ninety-one thousand, nine hundred twelve".