19740765 has 32 divisors (see below), whose sum is σ = 34699392. Its totient is φ = 9504000.

The previous prime is 19740737. The next prime is 19740781. The reversal of 19740765 is 56704791.

It is not a de Polignac number, because 19740765 - 2¹² = 19736669 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 29535 + ... + 30195.

It is an arithmetic number, because the mean of its divisors is an integer number (1084356).

Almost surely, 2^19740765 is an apocalyptic number.

19740765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19740765 is a deficient number, since it is larger than the sum of its proper divisors (14958627).

19740765 is a wasteful number, since it uses less digits than its factorization.

19740765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 19740765 is about 4443.0580684929. The cubic root of 19740765 is about 270.2638709787.

The spelling of 19740765 in words is "nineteen million, seven hundred forty thousand, seven hundred sixty-five".