1906620 has 48 divisors (see below), whose sum is σ = 5470080. Its totient is φ = 495936.

The previous prime is 1906613. The next prime is 1906621. The reversal of 1906620 is 266091.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1906621) 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 15 ways as a sum of consecutive naturals, for example, 2211 + ... + 2949.

It is an arithmetic number, because the mean of its divisors is an integer number (113960).

2^1906620 is an apocalyptic number.

1906620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1906620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2735040).

1906620 is an abundant number, since it is smaller than the sum of its proper divisors (3563460).

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

1906620 is a wasteful number, since it uses less digits than its factorization.

1906620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1906620 is about 1380.8041135512. The cubic root of 1906620 is about 123.9999132847. Note that the first 4 decimals are identical.

The spelling of 1906620 in words is "one million, nine hundred six thousand, six hundred twenty".