1065840465 has 16 divisors (see below), whose sum is σ = 1705772736. Its totient is φ = 568305600.

The previous prime is 1065840431. The next prime is 1065840467. The reversal of 1065840465 is 5640485601.

It is a happy number.

It is not a de Polignac number, because 1065840465 - 2¹⁶ = 1065774929 is a prime.

It is a super-2 number, since 2×1065840465² = 2272031793662832450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1065840467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84255 + ... + 96075.

It is an arithmetic number, because the mean of its divisors is an integer number (106610796).

Almost surely, 2^1065840465 is an apocalyptic number.

1065840465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1065840465 is a deficient number, since it is larger than the sum of its proper divisors (639932271).

1065840465 is a wasteful number, since it uses less digits than its factorization.

1065840465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17840.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 1065840465 is about 32647.2122087017. The cubic root of 1065840465 is about 1021.4820391638.

The spelling of 1065840465 in words is "one billion, sixty-five million, eight hundred forty thousand, four hundred sixty-five".