12961986 has 16 divisors (see below), whose sum is σ = 26556768. Its totient is φ = 4215200.

The previous prime is 12961979. The next prime is 12961987. The reversal of 12961986 is 68916921.

It is a super-3 number, since 3×12961986³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (12961987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26100 + ... + 26591.

It is an arithmetic number, because the mean of its divisors is an integer number (1659798).

Almost surely, 2^12961986 is an apocalyptic number.

12961986 is an abundant number, since it is smaller than the sum of its proper divisors (13594782).

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

12961986 is a wasteful number, since it uses less digits than its factorization.

12961986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52737.

The product of its digits is 46656, while the sum is 42.

The square root of 12961986 is about 3600.2758227669. The cubic root of 12961986 is about 234.9040562017.

The spelling of 12961986 in words is "twelve million, nine hundred sixty-one thousand, nine hundred eighty-six".