1906820 has 24 divisors (see below), whose sum is σ = 4066944. Its totient is φ = 750816.

The previous prime is 1906811. The next prime is 1906829. The reversal of 1906820 is 286091.

It is an interprime number because it is at equal distance from previous prime (1906811) and next prime (1906829).

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 1906820.

It is not an unprimeable number, because it can be changed into a prime (1906829) 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, 629 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (169456).

2^1906820 is an apocalyptic number.

1906820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1906820 is an abundant number, since it is smaller than the sum of its proper divisors (2160124).

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

1906820 is a wasteful number, since it uses less digits than its factorization.

1906820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1906820 is about 1380.8765332208. The cubic root of 1906820 is about 124.0042489005.

The spelling of 1906820 in words is "one million, nine hundred six thousand, eight hundred twenty".