19964406 has 64 divisors (see below), whose sum is σ = 50503680. Its totient is φ = 5110560.

The previous prime is 19964389. The next prime is 19964429. The reversal of 19964406 is 60446991.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36225 + ... + 36771.

It is an arithmetic number, because the mean of its divisors is an integer number (789120).

Almost surely, 2^19964406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19964406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25251840).

19964406 is an abundant number, since it is smaller than the sum of its proper divisors (30539274).

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

19964406 is a wasteful number, since it uses less digits than its factorization.

19964406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 19964406 is about 4468.1546526502. The cubic root of 19964406 is about 271.2806377365.

The spelling of 19964406 in words is "nineteen million, nine hundred sixty-four thousand, four hundred six".