1138525890 has 64 divisors (see below), whose sum is σ = 2813374080. Its totient is φ = 294658560.

The previous prime is 1138525879. The next prime is 1138525901. The reversal of 1138525890 is 985258311.

It is an interprime number because it is at equal distance from previous prime (1138525879) and next prime (1138525901).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 543966 + ... + 546054.

It is an arithmetic number, because the mean of its divisors is an integer number (43958970).

Almost surely, 2^1138525890 is an apocalyptic number.

1138525890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138525890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406687040).

1138525890 is an abundant number, since it is smaller than the sum of its proper divisors (1674848190).

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

1138525890 is a wasteful number, since it uses less digits than its factorization.

1138525890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 1138525890 is about 33742.0492857206. The cubic root of 1138525890 is about 1044.1934635819.

The spelling of 1138525890 in words is "one billion, one hundred thirty-eight million, five hundred twenty-five thousand, eight hundred ninety".