1921490 has 8 divisors (see below), whose sum is σ = 3458700. Its totient is φ = 768592.

The previous prime is 1921483. The next prime is 1921499. The reversal of 1921490 is 941291.

It can be written as a sum of positive squares in 2 ways, for example, as 1852321 + 69169 = 1361^2 + 263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1921499) 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 3 ways as a sum of consecutive naturals, for example, 96065 + ... + 96084.

2^1921490 is an apocalyptic number.

1921490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1921490 is a deficient number, since it is larger than the sum of its proper divisors (1537210).

1921490 is a wasteful number, since it uses less digits than its factorization.

1921490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192156.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1921490 is about 1386.1781992226. The cubic root of 1921490 is about 124.3214431501.

The spelling of 1921490 in words is "one million, nine hundred twenty-one thousand, four hundred ninety".