1020387 has 4 divisors (see below), whose sum is σ = 1360520. Its totient is φ = 680256.

The previous prime is 1020379. The next prime is 1020389. The reversal of 1020387 is 7830201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1020387 - 2³ = 1020379 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170062 + ... + 170067.

It is an arithmetic number, because the mean of its divisors is an integer number (340130).

2^1020387 is an apocalyptic number.

1020387 is a deficient number, since it is larger than the sum of its proper divisors (340133).

1020387 is an equidigital number, since it uses as much as digits as its factorization.

1020387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340132.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1020387 is about 1010.1420692160. The cubic root of 1020387 is about 100.6750001629.

Adding to 1020387 its reverse (7830201), we get a palindrome (8850588).

The spelling of 1020387 in words is "one million, twenty thousand, three hundred eighty-seven".