19440240 has 40 divisors (see below), whose sum is σ = 60265488. Its totient is φ = 5184000.

The previous prime is 19440233. The next prime is 19440263. The reversal of 19440240 is 4204491.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 19440240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40261 + ... + 40740.

Almost surely, 2^19440240 is an apocalyptic number.

19440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19440240 is an abundant number, since it is smaller than the sum of its proper divisors (40825248).

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

19440240 is a wasteful number, since it uses less digits than its factorization.

19440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81017 (or 81011 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 19440240 is about 4409.1087534784. The cubic root of 19440240 is about 268.8853913086.

It can be divided in two parts, 19440 and 240, that multiplied together give a square (4665600 = 2160²).

The spelling of 19440240 in words is "nineteen million, four hundred forty thousand, two hundred forty".