1920390 has 16 divisors (see below), whose sum is σ = 4609008. Its totient is φ = 512096.

The previous prime is 1920383. The next prime is 1920397. The reversal of 1920390 is 930291.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1920383) and next prime (1920397).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1920390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31977 + ... + 32036.

It is an arithmetic number, because the mean of its divisors is an integer number (288063).

2^1920390 is an apocalyptic number.

1920390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1920390 is an abundant number, since it is smaller than the sum of its proper divisors (2688618).

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

1920390 is a wasteful number, since it uses less digits than its factorization.

1920390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64023.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 1920390 is about 1385.7813680375. The cubic root of 1920390 is about 124.2977150898.

Subtracting from 1920390 its reverse (930291), we obtain a palindrome (990099).

The spelling of 1920390 in words is "one million, nine hundred twenty thousand, three hundred ninety".