1921642 has 8 divisors (see below), whose sum is σ = 2943936. Its totient is φ = 940332.

The previous prime is 1921631. The next prime is 1921657. The reversal of 1921642 is 2461291.

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

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 3 ways as a sum of consecutive naturals, for example, 10128 + ... + 10315.

It is an arithmetic number, because the mean of its divisors is an integer number (367992).

2^1921642 is an apocalyptic number.

1921642 is a deficient number, since it is larger than the sum of its proper divisors (1022294).

1921642 is a wasteful number, since it uses less digits than its factorization.

1921642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20492.

The product of its digits is 864, while the sum is 25.

The square root of 1921642 is about 1386.2330251440. The cubic root of 1921642 is about 124.3247212244.

The spelling of 1921642 in words is "one million, nine hundred twenty-one thousand, six hundred forty-two".