11878581 has 16 divisors (see below), whose sum is σ = 18607680. Its totient is φ = 6645120.

The previous prime is 11878579. The next prime is 11878583. The reversal of 11878581 is 18587811.

11878581 = T₃₃₄ + T₃₃₅ + ... + T₄₇₆.

It is an interprime number because it is at equal distance from previous prime (11878579) and next prime (11878583).

It is not a de Polignac number, because 11878581 - 2¹ = 11878579 is a prime.

It is a super-2 number, since 2×11878581² = 282201373147122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11878583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13416 + ... + 14273.

It is an arithmetic number, because the mean of its divisors is an integer number (1162980).

Almost surely, 2^11878581 is an apocalyptic number.

11878581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11878581 is a deficient number, since it is larger than the sum of its proper divisors (6729099).

11878581 is a wasteful number, since it uses less digits than its factorization.

11878581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27716.

The product of its digits is 17920, while the sum is 39.

The square root of 11878581 is about 3446.5317349475. The cubic root of 11878581 is about 228.1680624531.

The spelling of 11878581 in words is "eleven million, eight hundred seventy-eight thousand, five hundred eighty-one".