11908391 has 4 divisors (see below), whose sum is σ = 12990984. Its totient is φ = 10825800.

The previous prime is 11908373. The next prime is 11908427. The reversal of 11908391 is 19380911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19380911 = 11 ⋅1761901.

It is a cyclic number.

It is not a de Polignac number, because 11908391 - 2¹⁸ = 11646247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11908301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541280 + ... + 541301.

It is an arithmetic number, because the mean of its divisors is an integer number (3247746).

Almost surely, 2^11908391 is an apocalyptic number.

11908391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11908391 is a deficient number, since it is larger than the sum of its proper divisors (1082593).

11908391 is a wasteful number, since it uses less digits than its factorization.

11908391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082592.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 11908391 is about 3450.8536625015. The cubic root of 11908391 is about 228.3587700837.

The spelling of 11908391 in words is "eleven million, nine hundred eight thousand, three hundred ninety-one".