19921902 has 128 divisors (see below), whose sum is σ = 55738368. Its totient is φ = 4579200.

The previous prime is 19921901. The next prime is 19921921. The reversal of 19921902 is 20912991.

19921902 is nontrivially palindromic in base 5.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 186133 + ... + 186239.

It is an arithmetic number, because the mean of its divisors is an integer number (435456).

Almost surely, 2^19921902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19921902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27869184).

19921902 is an abundant number, since it is smaller than the sum of its proper divisors (35816466).

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

19921902 is a wasteful number, since it uses less digits than its factorization.

19921902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 19921902 is about 4463.3957924432. The cubic root of 19921902 is about 271.0879831241.

The spelling of 19921902 in words is "nineteen million, nine hundred twenty-one thousand, nine hundred two".