1018729409 has 8 divisors (see below), whose sum is σ = 1097313792. Its totient is φ = 943002720.

The previous prime is 1018729351. The next prime is 1018729417. The reversal of 1018729409 is 9049278101.

1018729409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1018729409 - 2¹² = 1018725313 is a prime.

It is a super-2 number, since 2×1018729409² = 2075619217522978562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1018729109) 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, 713684 + ... + 715109.

It is an arithmetic number, because the mean of its divisors is an integer number (137164224).

Almost surely, 2^1018729409 is an apocalyptic number.

It is an amenable number.

1018729409 is a deficient number, since it is larger than the sum of its proper divisors (78584383).

1018729409 is a wasteful number, since it uses less digits than its factorization.

1018729409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428847.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1018729409 is about 31917.5407730608. The cubic root of 1018729409 is about 1006.2045601486.

The spelling of 1018729409 in words is "one billion, eighteen million, seven hundred twenty-nine thousand, four hundred nine".