1969890 has 32 divisors (see below), whose sum is σ = 5092416. Its totient is φ = 484800.

The previous prime is 1969889. The next prime is 1969907. The reversal of 1969890 is 989691.

It is a super-2 number, since 2×1969890² = 7760933224200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2136 + ... + 2915.

It is an arithmetic number, because the mean of its divisors is an integer number (159138).

2^1969890 is an apocalyptic number.

1969890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1969890 is an abundant number, since it is smaller than the sum of its proper divisors (3122526).

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

1969890 is a wasteful number, since it uses less digits than its factorization.

1969890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5074.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 1969890 is about 1403.5276983373. The cubic root of 1969890 is about 125.3566348583.

The spelling of 1969890 in words is "one million, nine hundred sixty-nine thousand, eight hundred ninety".