19764240 has 40 divisors (see below), whose sum is σ = 61269888. Its totient is φ = 5270400.

The previous prime is 19764229. The next prime is 19764257. The reversal of 19764240 is 4246791.

It is a happy number.

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

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, 40936 + ... + 41415.

Almost surely, 2^19764240 is an apocalyptic number.

19764240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19764240 is an abundant number, since it is smaller than the sum of its proper divisors (41505648).

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

19764240 is a wasteful number, since it uses less digits than its factorization.

19764240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82367 (or 82361 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 19764240 is about 4445.6990451446. The cubic root of 19764240 is about 270.3709578650.

It can be divided in two parts, 1976 and 4240, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 19764240 in words is "nineteen million, seven hundred sixty-four thousand, two hundred forty".