1138890 has 16 divisors (see below), whose sum is σ = 2733408. Its totient is φ = 303696.

The previous prime is 1138883. The next prime is 1138901. The reversal of 1138890 is 988311.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 37963 = 1138890 / (1 + 1 + 3 + 8 + 8 + 9 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18952 + ... + 19011.

It is an arithmetic number, because the mean of its divisors is an integer number (170838).

2^1138890 is an apocalyptic number.

1138890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1138890 is an abundant number, since it is smaller than the sum of its proper divisors (1594518).

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

1138890 is a wasteful number, since it uses less digits than its factorization.

1138890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37973.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1138890 is about 1067.1878934846. The cubic root of 1138890 is about 104.4304765621.

The spelling of 1138890 in words is "one million, one hundred thirty-eight thousand, eight hundred ninety".