11972137 has 4 divisors (see below), whose sum is σ = 11981440. Its totient is φ = 11962836.

The previous prime is 11972113. The next prime is 11972141. The reversal of 11972137 is 73127911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 73127911 = 47 ⋅1555913.

It is a cyclic number.

It is not a de Polignac number, because 11972137 - 2²³ = 3583529 is a prime.

It is a super-3 number, since 3×11972137³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11972099 and 11972108.

It is not an unprimeable number, because it can be changed into a prime (11972537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2337 + ... + 5422.

It is an arithmetic number, because the mean of its divisors is an integer number (2995360).

Almost surely, 2^11972137 is an apocalyptic number.

It is an amenable number.

11972137 is a deficient number, since it is larger than the sum of its proper divisors (9303).

11972137 is an equidigital number, since it uses as much as digits as its factorization.

11972137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9302.

The product of its digits is 2646, while the sum is 31.

The square root of 11972137 is about 3460.0776002859. The cubic root of 11972137 is about 228.7655157839.

The spelling of 11972137 in words is "eleven million, nine hundred seventy-two thousand, one hundred thirty-seven".