19481940 has 36 divisors (see below), whose sum is σ = 59095764. Its totient is φ = 5195136.

The previous prime is 19481933. The next prime is 19481941. The reversal of 19481940 is 4918491.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 8749764 = 3276^2 + 2958^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19481895 and 19481904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19481941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53937 + ... + 54296.

It is an arithmetic number, because the mean of its divisors is an integer number (1641549).

Almost surely, 2^19481940 is an apocalyptic number.

19481940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19481940 is an abundant number, since it is smaller than the sum of its proper divisors (39613824).

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

19481940 is a wasteful number, since it uses less digits than its factorization.

19481940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108248 (or 108243 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19481940 is about 4413.8350671497. The cubic root of 19481940 is about 269.0775102206.

The spelling of 19481940 in words is "nineteen million, four hundred eighty-one thousand, nine hundred forty".