11971790 has 16 divisors (see below), whose sum is σ = 21664368. Its totient is φ = 4763136.

The previous prime is 11971787. The next prime is 11971801. The reversal of 11971790 is 9717911.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 11971790.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172 + ... + 5031.

It is an arithmetic number, because the mean of its divisors is an integer number (1354023).

Almost surely, 2^11971790 is an apocalyptic number.

11971790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11971790 is a deficient number, since it is larger than the sum of its proper divisors (9692578).

11971790 is a wasteful number, since it uses less digits than its factorization.

11971790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6403.

The product of its (nonzero) digits is 3969, while the sum is 35.

The square root of 11971790 is about 3460.0274565385. The cubic root of 11971790 is about 228.7633055853.

It can be divided in two parts, 1 and 1971790, that added together give a palindrome (1971791).

The spelling of 11971790 in words is "eleven million, nine hundred seventy-one thousand, seven hundred ninety".