1138485909 has 64 divisors (see below), whose sum is σ = 1815045120. Its totient is φ = 627264000.

The previous prime is 1138485863. The next prime is 1138485919. The reversal of 1138485909 is 9095848311.

It is not a de Polignac number, because 1138485909 - 2¹¹ = 1138483861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138485919) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1722039 + ... + 1722699.

It is an arithmetic number, because the mean of its divisors is an integer number (28360080).

Almost surely, 2^1138485909 is an apocalyptic number.

1138485909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1138485909 is a deficient number, since it is larger than the sum of its proper divisors (676559211).

1138485909 is a wasteful number, since it uses less digits than its factorization.

1138485909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 1138485909 is about 33741.4568298406. The cubic root of 1138485909 is about 1044.1812406458.

The spelling of 1138485909 in words is "one billion, one hundred thirty-eight million, four hundred eighty-five thousand, nine hundred nine".