1138895640 has 160 divisors (see below), whose sum is σ = 3842776080. Its totient is φ = 302531328.

The previous prime is 1138895629. The next prime is 1138895647. The reversal of 1138895640 is 465988311.

1138895640 is a `hidden beast` number, since 1 + 1 + 3 + 8 + 89 + 564 + 0 = 666.

It is a super-2 number, since 2×1138895640² = 2594166557622019200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138895647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1123774 + ... + 1124786.

Almost surely, 2^1138895640 is an apocalyptic number.

1138895640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138895640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1921388040).

1138895640 is an abundant number, since it is smaller than the sum of its proper divisors (2703880440).

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

1138895640 is a wasteful number, since it uses less digits than its factorization.

1138895640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1138895640 is about 33747.5279094632. The cubic root of 1138895640 is about 1044.3064894833.

The spelling of 1138895640 in words is "one billion, one hundred thirty-eight million, eight hundred ninety-five thousand, six hundred forty".