11697921 has 24 divisors (see below), whose sum is σ = 18091944. Its totient is φ = 7257600.

The previous prime is 11697919. The next prime is 11697929. The reversal of 11697921 is 12979611.

11697921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7096896 + 4601025 = 2664^2 + 2145^2 .

It is not a de Polignac number, because 11697921 - 2¹ = 11697919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11697929) 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, 15075 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (753831).

Almost surely, 2^11697921 is an apocalyptic number.

It is an amenable number.

11697921 is a deficient number, since it is larger than the sum of its proper divisors (6394023).

11697921 is a wasteful number, since it uses less digits than its factorization.

11697921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 878 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 11697921 is about 3420.2223611923. Note that the first 3 decimals coincide. The cubic root of 11697921 is about 227.0054207662.

The spelling of 11697921 in words is "eleven million, six hundred ninety-seven thousand, nine hundred twenty-one".