4009965 has 16 divisors (see below), whose sum is σ = 6566208. Its totient is φ = 2088576.

The previous prime is 4009939. The next prime is 4009991. The reversal of 4009965 is 5699004.

It is a happy number.

4009965 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (4009939) and next prime (4009991).

It is not a de Polignac number, because 4009965 - 2⁵ = 4009933 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2464 + ... + 3753.

It is an arithmetic number, because the mean of its divisors is an integer number (410388).

Almost surely, 2^4009965 is an apocalyptic number.

It is an amenable number.

4009965 is a deficient number, since it is larger than the sum of its proper divisors (2556243).

4009965 is a wasteful number, since it uses less digits than its factorization.

4009965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6268.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 4009965 is about 2002.4897003480. The cubic root of 4009965 is about 158.8718163112.

The spelling of 4009965 in words is "four million, nine thousand, nine hundred sixty-five".