11902409 has 2 divisors, whose sum is σ = 11902410. Its totient is φ = 11902408.

The previous prime is 11902393. The next prime is 11902427. The reversal of 11902409 is 90420911.

11902409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 4826809 = 2660^2 + 2197^2 .

It is a cyclic number.

It is not a de Polignac number, because 11902409 - 2⁴ = 11902393 is a prime.

It is a super-3 number, since 3×11902409³ (a number of 22 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11902459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5951204 + 5951205.

It is an arithmetic number, because the mean of its divisors is an integer number (5951205).

Almost surely, 2^11902409 is an apocalyptic number.

It is an amenable number.

11902409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11902409 is an equidigital number, since it uses as much as digits as its factorization.

11902409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 11902409 is about 3449.9868115690. The cubic root of 11902409 is about 228.3205261552.

The spelling of 11902409 in words is "eleven million, nine hundred two thousand, four hundred nine".