1913889 has 8 divisors (see below), whose sum is σ = 2686240. Its totient is φ = 1208736.

The previous prime is 1913867. The next prime is 1913893. The reversal of 1913889 is 9883191.

It is a happy number.

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

It is not a de Polignac number, because 1913889 - 2⁹ = 1913377 is a prime.

It is a super-2 number, since 2×1913889² = 7325942208642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913819) 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, 16732 + ... + 16845.

It is an arithmetic number, because the mean of its divisors is an integer number (335780).

2^1913889 is an apocalyptic number.

1913889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1913889 is a deficient number, since it is larger than the sum of its proper divisors (772351).

1913889 is a wasteful number, since it uses less digits than its factorization.

1913889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33599.

The product of its digits is 15552, while the sum is 39.

The square root of 1913889 is about 1383.4337714542. The cubic root of 1913889 is about 124.1572969122.

The spelling of 1913889 in words is "one million, nine hundred thirteen thousand, eight hundred eighty-nine".