1020819 has 8 divisors (see below), whose sum is σ = 1368000. Its totient is φ = 677096.

The previous prime is 1020797. The next prime is 1020821. The reversal of 1020819 is 9180201.

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 1020819 - 2¹⁵ = 988051 is a prime.

It is a super-2 number, since 2×1020819² = 2084142861522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020795 and 1020804.

It is not an unprimeable number, because it can be changed into a prime (1020839) 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, 69 + ... + 1430.

It is an arithmetic number, because the mean of its divisors is an integer number (171000).

2^1020819 is an apocalyptic number.

1020819 is a deficient number, since it is larger than the sum of its proper divisors (347181).

1020819 is a wasteful number, since it uses less digits than its factorization.

1020819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1020819 is about 1010.3558778965. The cubic root of 1020819 is about 100.6892057090.

The spelling of 1020819 in words is "one million, twenty thousand, eight hundred nineteen".