1923890 has 16 divisors (see below), whose sum is σ = 3667032. Its totient is φ = 724224.

The previous prime is 1923877. The next prime is 1923893. The reversal of 1923890 is 983291.

It can be written as a sum of positive squares in 4 ways, for example, as 1923769 + 121 = 1387^2 + 11^2 .

It is not an unprimeable number, because it can be changed into a prime (1923893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5489 + ... + 5828.

2^1923890 is an apocalyptic number.

1923890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1923890 is a deficient number, since it is larger than the sum of its proper divisors (1743142).

1923890 is a wasteful number, since it uses less digits than its factorization.

1923890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11341.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1923890 is about 1387.0436186364. The cubic root of 1923890 is about 124.3731820480.

The spelling of 1923890 in words is "one million, nine hundred twenty-three thousand, eight hundred ninety".