1920231 has 6 divisors (see below), whose sum is σ = 2773680. Its totient is φ = 1280148.

The previous prime is 1920227. The next prime is 1920239. The reversal of 1920231 is 1320291.

It is a happy number.

It is not a de Polignac number, because 1920231 - 2² = 1920227 is a prime.

It is a super-2 number, since 2×1920231² = 7374574186722, which contains 22 as substring.

1920231 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106671 + ... + 106688.

It is an arithmetic number, because the mean of its divisors is an integer number (462280).

2^1920231 is an apocalyptic number.

1920231 is a deficient number, since it is larger than the sum of its proper divisors (853449).

1920231 is a wasteful number, since it uses less digits than its factorization.

1920231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213365 (or 213362 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1920231 is about 1385.7239984932. The cubic root of 1920231 is about 124.2942845571.

The spelling of 1920231 in words is "one million, nine hundred twenty thousand, two hundred thirty-one".