11992890 has 128 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 2407680.

The previous prime is 11992889. The next prime is 11992891. The reversal of 11992890 is 9829911.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11992889) and next prime (11992891).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11992891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 62695 + ... + 62885.

It is an arithmetic number, because the mean of its divisors is an integer number (290304).

Almost surely, 2^11992890 is an apocalyptic number.

11992890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11992890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18579456).

11992890 is an abundant number, since it is smaller than the sum of its proper divisors (25166022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11992890 is a wasteful number, since it uses less digits than its factorization.

11992890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 11992890 is about 3463.0752229774. The cubic root of 11992890 is about 228.8976233649.

The spelling of 11992890 in words is "eleven million, nine hundred ninety-two thousand, eight hundred ninety".