1900920 has 128 divisors (see below), whose sum is σ = 6819840. Its totient is φ = 414720.

The previous prime is 1900907. The next prime is 1900937. The reversal of 1900920 is 290091.

It is a happy number.

It is a super-2 number, since 2×1900920² = 7226993692800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26004 + ... + 26076.

It is an arithmetic number, because the mean of its divisors is an integer number (53280).

2^1900920 is an apocalyptic number.

1900920 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 1900920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3409920).

1900920 is an abundant number, since it is smaller than the sum of its proper divisors (4918920).

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

1900920 is a wasteful number, since it uses less digits than its factorization.

1900920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1900920 is about 1378.7385538963. The cubic root of 1900920 is about 123.8762205679.

The spelling of 1900920 in words is "one million, nine hundred thousand, nine hundred twenty".