11651980 has 24 divisors (see below), whose sum is σ = 24533712. Its totient is φ = 4648512.

The previous prime is 11651977. The next prime is 11651993. The reversal of 11651980 is 8915611.

11651980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 13234 + ... + 14086.

It is an arithmetic number, because the mean of its divisors is an integer number (1022238).

Almost surely, 2^11651980 is an apocalyptic number.

11651980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11651980 is an abundant number, since it is smaller than the sum of its proper divisors (12881732).

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

11651980 is a wasteful number, since it uses less digits than its factorization.

11651980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11651980 is about 3413.4996704262. The cubic root of 11651980 is about 226.7078596799.

The spelling of 11651980 in words is "eleven million, six hundred fifty-one thousand, nine hundred eighty".