1900720 has 40 divisors (see below), whose sum is σ = 4615776. Its totient is φ = 726528.

The previous prime is 1900711. The next prime is 1900721. The reversal of 1900720 is 270091.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1900720² = 7225473036800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1900721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1324 + ... + 2356.

2^1900720 is an apocalyptic number.

1900720 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 1900720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2307888).

1900720 is an abundant number, since it is smaller than the sum of its proper divisors (2715056).

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

1900720 is a wasteful number, since it uses less digits than its factorization.

1900720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 1900720 is about 1378.6660219212. Note that the first 3 decimals coincide. The cubic root of 1900720 is about 123.8718759851.

The spelling of 1900720 in words is "one million, nine hundred thousand, seven hundred twenty".