19442940 has 96 divisors (see below), whose sum is σ = 60238080. Its totient is φ = 4646400.

The previous prime is 19442939. The next prime is 19442953. The reversal of 19442940 is 4924491.

19442940 = T₆₁₆ + T₆₁₇ + ... + T₇₀₄.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58575 + ... + 58905.

It is an arithmetic number, because the mean of its divisors is an integer number (627480).

Almost surely, 2^19442940 is an apocalyptic number.

19442940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19442940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30119040).

19442940 is an abundant number, since it is smaller than the sum of its proper divisors (40795140).

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

19442940 is a wasteful number, since it uses less digits than its factorization.

19442940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 19442940 is about 4409.4149271757. The cubic root of 19442940 is about 268.8978389764.

It can be divided in two parts, 1944 and 2940, that added together give a palindrome (4884).

The spelling of 19442940 in words is "nineteen million, four hundred forty-two thousand, nine hundred forty".