1921898 has 8 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 873580.

The previous prime is 1921889. The next prime is 1921919. The reversal of 1921898 is 8981291.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43658 + ... + 43701.

It is an arithmetic number, because the mean of its divisors is an integer number (393120).

2^1921898 is an apocalyptic number.

1921898 is a deficient number, since it is larger than the sum of its proper divisors (1223062).

1921898 is a wasteful number, since it uses less digits than its factorization.

1921898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87372.

The product of its digits is 10368, while the sum is 38.

The square root of 1921898 is about 1386.3253586370. The cubic root of 1921898 is about 124.3302418010.

The spelling of 1921898 in words is "one million, nine hundred twenty-one thousand, eight hundred ninety-eight".