1209041138 has 18 divisors (see below), whose sum is σ = 1897615629. Its totient is φ = 577696152.

The previous prime is 1209041131. The next prime is 1209041149. The reversal of 1209041138 is 8311409021.

It can be written as a sum of positive squares in 2 ways, for example, as 1207771009 + 1270129 = 34753^2 + 1127^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24587.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1209041138.

It is not an unprimeable number, because it can be changed into a prime (1209041131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1130468 + ... + 1131536.

Almost surely, 2^1209041138 is an apocalyptic number.

1209041138 is a deficient number, since it is larger than the sum of its proper divisors (688574491).

1209041138 is an frugal number, since it uses more digits than its factorization.

1209041138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1209041138 is about 34771.2688580673. The cubic root of 1209041138 is about 1065.3206842847.

The spelling of 1209041138 in words is "one billion, two hundred nine million, forty-one thousand, one hundred thirty-eight".