19481540 has 24 divisors (see below), whose sum is σ = 44058840. Its totient is φ = 7193088.

The previous prime is 19481521. The next prime is 19481543. The reversal of 19481540 is 4518491.

It can be written as a sum of positive squares in 4 ways, for example, as 3625216 + 15856324 = 1904^2 + 3982^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19481497 and 19481506.

It is not an unprimeable number, because it can be changed into a prime (19481543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37205 + ... + 37724.

It is an arithmetic number, because the mean of its divisors is an integer number (1835785).

Almost surely, 2^19481540 is an apocalyptic number.

19481540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19481540 is an abundant number, since it is smaller than the sum of its proper divisors (24577300).

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

19481540 is a wasteful number, since it uses less digits than its factorization.

19481540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74951 (or 74949 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 19481540 is about 4413.7897548479. The cubic root of 19481540 is about 269.0756686562.

The spelling of 19481540 in words is "nineteen million, four hundred eighty-one thousand, five hundred forty".