11399971 has 16 divisors (see below), whose sum is σ = 13003776. Its totient is φ = 9900000.

The previous prime is 11399957. The next prime is 11399977. The reversal of 11399971 is 17999311.

It is not a de Polignac number, because 11399971 - 2⁵ = 11399939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11399977) 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, 34276 + ... + 34606.

It is an arithmetic number, because the mean of its divisors is an integer number (812736).

Almost surely, 2^11399971 is an apocalyptic number.

11399971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11399971 is a deficient number, since it is larger than the sum of its proper divisors (1603805).

11399971 is a wasteful number, since it uses less digits than its factorization.

11399971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474.

The product of its digits is 15309, while the sum is 40.

The square root of 11399971 is about 3376.3843086947. The cubic root of 11399971 is about 225.0615206257.

The spelling of 11399971 in words is "eleven million, three hundred ninety-nine thousand, nine hundred seventy-one".