11951865 has 24 divisors (see below), whose sum is σ = 21161088. Its totient is φ = 6237600.

The previous prime is 11951861. The next prime is 11951873. The reversal of 11951865 is 56815911.

It is not a de Polignac number, because 11951865 - 2² = 11951861 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11951861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 711 + ... + 4940.

It is an arithmetic number, because the mean of its divisors is an integer number (881712).

Almost surely, 2^11951865 is an apocalyptic number.

11951865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11951865 is a deficient number, since it is larger than the sum of its proper divisors (9209223).

11951865 is a wasteful number, since it uses less digits than its factorization.

11951865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5709 (or 5706 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 11951865 is about 3457.1469450979. The cubic root of 11951865 is about 228.6363226269.

It can be divided in two parts, 119 and 51865, that added together give a square (51984 = 228²).

The spelling of 11951865 in words is "eleven million, nine hundred fifty-one thousand, eight hundred sixty-five".