19421650 has 48 divisors (see below), whose sum is σ = 38897064. Its totient is φ = 7188480.

The previous prime is 19421641. The next prime is 19421651. The reversal of 19421650 is 5612491.

It is a Cunningham number, because it is equal to 4407²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 123201 + 19298449 = 351^2 + 4393^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19421651) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 61894 + ... + 62206.

Almost surely, 2^19421650 is an apocalyptic number.

19421650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19421650 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

19421650 is a wasteful number, since it uses less digits than its factorization.

19421650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 19421650 is about 4407.0001134559. Note that the first 3 decimals coincide. The cubic root of 19421650 is about 268.7996555085.

The spelling of 19421650 in words is "nineteen million, four hundred twenty-one thousand, six hundred fifty".