19499040 has 144 divisors (see below), whose sum is σ = 72648576. Its totient is φ = 4723200.

The previous prime is 19498981. The next prime is 19499041. The reversal of 19499040 is 4099491.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 19498986 and 19499004.

It is not an unprimeable number, because it can be changed into a prime (19499041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15225 + ... + 16455.

It is an arithmetic number, because the mean of its divisors is an integer number (504504).

Almost surely, 2^19499040 is an apocalyptic number.

19499040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19499040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36324288).

19499040 is an abundant number, since it is smaller than the sum of its proper divisors (53149536).

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

19499040 is a wasteful number, since it uses less digits than its factorization.

19499040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19499040 is about 4415.7717332308. The cubic root of 19499040 is about 269.1562135369.

The spelling of 19499040 in words is "nineteen million, four hundred ninety-nine thousand, forty".