19542040 has 64 divisors (see below), whose sum is σ = 51010560. Its totient is φ = 6599040.

The previous prime is 19542011. The next prime is 19542041. The reversal of 19542040 is 4024591.

It is a junction number, because it is equal to n+sod(n) for n = 19541996 and 19542014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19542041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19389 + ... + 20371.

It is an arithmetic number, because the mean of its divisors is an integer number (797040).

Almost surely, 2^19542040 is an apocalyptic number.

19542040 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 19542040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25505280).

19542040 is an abundant number, since it is smaller than the sum of its proper divisors (31468520).

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

19542040 is a wasteful number, since it uses less digits than its factorization.

19542040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1068 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 19542040 is about 4420.6379630094. The cubic root of 19542040 is about 269.3539193384.

The spelling of 19542040 in words is "nineteen million, five hundred forty-two thousand, forty".