19840465 has 16 divisors (see below), whose sum is σ = 25873920. Its totient is φ = 14549760.

The previous prime is 19840463. The next prime is 19840487. The reversal of 19840465 is 56404891.

It is a happy number.

It is not a de Polignac number, because 19840465 - 2¹ = 19840463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19840463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (1617120).

Almost surely, 2^19840465 is an apocalyptic number.

It is an amenable number.

19840465 is a deficient number, since it is larger than the sum of its proper divisors (6033455).

19840465 is a wasteful number, since it uses less digits than its factorization.

19840465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 19840465 is about 4454.2636877491. The cubic root of 19840465 is about 270.7180930363.

The spelling of 19840465 in words is "nineteen million, eight hundred forty thousand, four hundred sixty-five".