1031620 has 12 divisors (see below), whose sum is σ = 2166444. Its totient is φ = 412640.

The previous prime is 1031609. The next prime is 1031623. The reversal of 1031620 is 261301.

It can be written as a sum of positive squares in 2 ways, for example, as 125316 + 906304 = 354^2 + 952^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1031620.

It is not an unprimeable number, because it can be changed into a prime (1031623) by changing a digit.

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, 25771 + ... + 25810.

It is an arithmetic number, because the mean of its divisors is an integer number (180537).

2^1031620 is an apocalyptic number.

1031620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031620 is an abundant number, since it is smaller than the sum of its proper divisors (1134824).

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

1031620 is a wasteful number, since it uses less digits than its factorization.

1031620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51590 (or 51588 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1031620 is about 1015.6869596485. The cubic root of 1031620 is about 101.0430819702.

Adding to 1031620 its reverse (261301), we get a palindrome (1292921).

The spelling of 1031620 in words is "one million, thirty-one thousand, six hundred twenty".