1021139 has 8 divisors (see below), whose sum is σ = 1235808. Its totient is φ = 823680.

The previous prime is 1021129. The next prime is 1021157. The reversal of 1021139 is 9311201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021139 - 2⁴ = 1021123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1021129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4172 + ... + 4409.

It is an arithmetic number, because the mean of its divisors is an integer number (154476).

2^1021139 is an apocalyptic number.

1021139 is a deficient number, since it is larger than the sum of its proper divisors (214669).

1021139 is an equidigital number, since it uses as much as digits as its factorization.

1021139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8605.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1021139 is about 1010.5142255307. The cubic root of 1021139 is about 100.6997257522.

The spelling of 1021139 in words is "one million, twenty-one thousand, one hundred thirty-nine".