11986557 has 16 divisors (see below), whose sum is σ = 17908032. Its totient is φ = 7067520.

The previous prime is 11986529. The next prime is 11986571. The reversal of 11986557 is 75568911.

It is not a de Polignac number, because 11986557 - 2⁶ = 11986493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11986577) 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, 3688 + ... + 6129.

It is an arithmetic number, because the mean of its divisors is an integer number (1119252).

Almost surely, 2^11986557 is an apocalyptic number.

It is an amenable number.

11986557 is a deficient number, since it is larger than the sum of its proper divisors (5921475).

11986557 is a wasteful number, since it uses less digits than its factorization.

11986557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9868.

The product of its digits is 75600, while the sum is 42.

The square root of 11986557 is about 3462.1607415023. The cubic root of 11986557 is about 228.8573254916.

The spelling of 11986557 in words is "eleven million, nine hundred eighty-six thousand, five hundred fifty-seven".