1920690 has 24 divisors (see below), whose sum is σ = 4994028. Its totient is φ = 512160.

The previous prime is 1920683. The next prime is 1920701. The reversal of 1920690 is 960291.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1766241 + 154449 = 1329^2 + 393^2 .

It is a super-2 number, since 2×1920690² = 7378100152200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10581 + ... + 10760.

2^1920690 is an apocalyptic number.

1920690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1920690 is an abundant number, since it is smaller than the sum of its proper divisors (3073338).

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

1920690 is a wasteful number, since it uses less digits than its factorization.

1920690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21354 (or 21351 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1920690 is about 1385.8896059932. The cubic root of 1920690 is about 124.3041872774.

The spelling of 1920690 in words is "one million, nine hundred twenty thousand, six hundred ninety".