1138901984 has 48 divisors (see below), whose sum is σ = 2452052736. Its totient is φ = 516412800.

The previous prime is 1138901969. The next prime is 1138901987. The reversal of 1138901984 is 4891098311.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138901987) 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 7 ways as a sum of consecutive naturals, for example, 147959 + ... + 155465.

It is an arithmetic number, because the mean of its divisors is an integer number (51084432).

Almost surely, 2^1138901984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138901984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226026368).

1138901984 is an abundant number, since it is smaller than the sum of its proper divisors (1313150752).

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

1138901984 is a wasteful number, since it uses less digits than its factorization.

1138901984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7959 (or 7951 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1138901984 is about 33747.6219014022. The cubic root of 1138901984 is about 1044.3084285161.

The spelling of 1138901984 in words is "one billion, one hundred thirty-eight million, nine hundred one thousand, nine hundred eighty-four".