11947409 has 4 divisors (see below), whose sum is σ = 12576240. Its totient is φ = 11318580.

The previous prime is 11947387. The next prime is 11947417. The reversal of 11947409 is 90474911.

11947409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 11947409 - 2⁸ = 11947153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11947489) 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, 314387 + ... + 314424.

It is an arithmetic number, because the mean of its divisors is an integer number (3144060).

Almost surely, 2^11947409 is an apocalyptic number.

11947409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11947409 is a deficient number, since it is larger than the sum of its proper divisors (628831).

11947409 is an equidigital number, since it uses as much as digits as its factorization.

11947409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628830.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 11947409 is about 3456.5024229704. The cubic root of 11947409 is about 228.6079050231.

The spelling of 11947409 in words is "eleven million, nine hundred forty-seven thousand, four hundred nine".