1900840 has 16 divisors (see below), whose sum is σ = 4276980. Its totient is φ = 760320.

The previous prime is 1900831. The next prime is 1900861. The reversal of 1900840 is 480091.

It can be written as a sum of positive squares in 2 ways, for example, as 1855044 + 45796 = 1362^2 + 214^2 .

It is a super-2 number, since 2×1900840² = 7226385411200, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 23721 + ... + 23800.

2^1900840 is an apocalyptic number.

1900840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1900840 is an abundant number, since it is smaller than the sum of its proper divisors (2376140).

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

1900840 is a wasteful number, since it uses less digits than its factorization.

1900840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47532 (or 47528 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1900840 is about 1378.7095415641. The cubic root of 1900840 is about 123.8744827713.

The spelling of 1900840 in words is "one million, nine hundred thousand, eight hundred forty".