19641240 has 48 divisors (see below), whose sum is σ = 63835200. Its totient is φ = 5237568.

The previous prime is 19641233. The next prime is 19641247. The reversal of 19641240 is 4214691.

19641240 is a `hidden beast` number, since 19 + 641 + 2 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (19641233) and next prime (19641247).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19641247) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 26920 + ... + 27639.

It is an arithmetic number, because the mean of its divisors is an integer number (1329900).

Almost surely, 2^19641240 is an apocalyptic number.

19641240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19641240 is an abundant number, since it is smaller than the sum of its proper divisors (44193960).

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

19641240 is a wasteful number, since it uses less digits than its factorization.

19641240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54576 (or 54569 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 19641240 is about 4431.8438600655. The cubic root of 19641240 is about 269.8089182994.

It can be divided in two parts, 19641 and 240, that added together give a square (19881 = 141²).

The spelling of 19641240 in words is "nineteen million, six hundred forty-one thousand, two hundred forty".