11891290 has 32 divisors (see below), whose sum is σ = 22394880. Its totient is φ = 4540800.

The previous prime is 11891287. The next prime is 11891291. The reversal of 11891290 is 9219811.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (11891291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27375 + ... + 27805.

It is an arithmetic number, because the mean of its divisors is an integer number (699840).

Almost surely, 2^11891290 is an apocalyptic number.

11891290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11891290 is a deficient number, since it is larger than the sum of its proper divisors (10503590).

11891290 is a wasteful number, since it uses less digits than its factorization.

11891290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 11891290 is about 3448.3749796100. The cubic root of 11891290 is about 228.2494064663.

The spelling of 11891290 in words is "eleven million, eight hundred ninety-one thousand, two hundred ninety".