1206389961 has 24 divisors (see below), whose sum is σ = 2016718080. Its totient is φ = 680636736.

The previous prime is 1206389941. The next prime is 1206389969. The reversal of 1206389961 is 1699836021.

It is a happy number.

1206389961 is a `hidden beast` number, since 1 + 2 + 0 + 638 + 9 + 9 + 6 + 1 = 666.

It is not a de Polignac number, because 1206389961 - 2¹⁹ = 1205865673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1206389969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116220 + ... + 126173.

It is an arithmetic number, because the mean of its divisors is an integer number (84029920).

Almost surely, 2^1206389961 is an apocalyptic number.

It is an amenable number.

1206389961 is a deficient number, since it is larger than the sum of its proper divisors (810328119).

1206389961 is a wasteful number, since it uses less digits than its factorization.

1206389961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242485 (or 242482 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1206389961 is about 34733.1248378259. The cubic root of 1206389961 is about 1064.5414385024.

The spelling of 1206389961 in words is "one billion, two hundred six million, three hundred eighty-nine thousand, nine hundred sixty-one".