19901406 has 32 divisors (see below), whose sum is σ = 46119168. Its totient is φ = 5607360.

The previous prime is 19901383. The next prime is 19901419. The reversal of 19901406 is 60410991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180 + ... + 6311.

It is an arithmetic number, because the mean of its divisors is an integer number (1441224).

Almost surely, 2^19901406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19901406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23059584).

19901406 is an abundant number, since it is smaller than the sum of its proper divisors (26217762).

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

19901406 is a wasteful number, since it uses less digits than its factorization.

19901406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6576.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 19901406 is about 4461.0991919033. The cubic root of 19901406 is about 270.9949845434.

The spelling of 19901406 in words is "nineteen million, nine hundred one thousand, four hundred six".