19423890 has 96 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 4758912.

The previous prime is 19423889. The next prime is 19423897. The reversal of 19423890 is 9832491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19423897) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63117 + ... + 63423.

It is an arithmetic number, because the mean of its divisors is an integer number (570570).

Almost surely, 2^19423890 is an apocalyptic number.

19423890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19423890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27387360).

19423890 is an abundant number, since it is smaller than the sum of its proper divisors (35350830).

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

19423890 is a wasteful number, since it uses less digits than its factorization.

19423890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 19423890 is about 4407.2542472610. The cubic root of 19423890 is about 268.8099891324.

It can be divided in two parts, 1942 and 3890, that added together give a cube (5832 = 18³).

The spelling of 19423890 in words is "nineteen million, four hundred twenty-three thousand, eight hundred ninety".