1921901 has 8 divisors (see below), whose sum is σ = 2052864. Its totient is φ = 1792960.

The previous prime is 1921889. The next prime is 1921919. The reversal of 1921901 is 1091291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921901 - 2¹⁴ = 1905517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1796 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (256608).

2^1921901 is an apocalyptic number.

It is an amenable number.

1921901 is a deficient number, since it is larger than the sum of its proper divisors (130963).

1921901 is a wasteful number, since it uses less digits than its factorization.

1921901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1921901 is about 1386.3264406337. The cubic root of 1921901 is about 124.3303064923.

The spelling of 1921901 in words is "one million, nine hundred twenty-one thousand, nine hundred one".