19421906 has 16 divisors (see below), whose sum is σ = 33359040. Its totient is φ = 8307600.

The previous prime is 19421879. The next prime is 19421911. The reversal of 19421906 is 60912491.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8825 + ... + 10803.

It is an arithmetic number, because the mean of its divisors is an integer number (2084940).

Almost surely, 2^19421906 is an apocalyptic number.

19421906 is a deficient number, since it is larger than the sum of its proper divisors (13937134).

19421906 is a wasteful number, since it uses less digits than its factorization.

19421906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 19421906 is about 4407.0291580610. The cubic root of 19421906 is about 268.8008365343.

The spelling of 19421906 in words is "nineteen million, four hundred twenty-one thousand, nine hundred six".