1021390 has 8 divisors (see below), whose sum is σ = 1838520. Its totient is φ = 408552.

The previous prime is 1021387. The next prime is 1021403. The reversal of 1021390 is 931201.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 51060 + ... + 51079.

It is an arithmetic number, because the mean of its divisors is an integer number (229815).

2^1021390 is an apocalyptic number.

1021390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021390 is a deficient number, since it is larger than the sum of its proper divisors (817130).

1021390 is a wasteful number, since it uses less digits than its factorization.

1021390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102146.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1021390 is about 1010.6384120941. The cubic root of 1021390 is about 100.7079758730.

Adding to 1021390 its reverse (931201), we get a palindrome (1952591).

The spelling of 1021390 in words is "one million, twenty-one thousand, three hundred ninety".