11978065 has 16 divisors (see below), whose sum is σ = 15863040. Its totient is φ = 8609920.

The previous prime is 11978063. The next prime is 11978069. The reversal of 11978065 is 56087911.

11978065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

11978065 is a nontrivial binomial coefficient, being equal to C(4895, 2).

It is not a de Polignac number, because 11978065 - 2¹ = 11978063 is a prime.

It is a super-2 number, since 2×11978065² = 286948082288450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11978063) 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, 3672 + ... + 6118.

It is an arithmetic number, because the mean of its divisors is an integer number (991440).

Almost surely, 2^11978065 is an apocalyptic number.

11978065 is the 4894-th triangular number.

11978065 is the 1632-nd centered nonagonal number.

It is an amenable number.

11978065 is a deficient number, since it is larger than the sum of its proper divisors (3884975).

11978065 is a wasteful number, since it uses less digits than its factorization.

11978065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 11978065 is about 3460.9341224588. The cubic root of 11978065 is about 228.8032672790.

The spelling of 11978065 in words is "eleven million, nine hundred seventy-eight thousand, sixty-five".