1921401 has 12 divisors (see below), whose sum is σ = 2878512. Its totient is φ = 1280772.

The previous prime is 1921393. The next prime is 1921417. The reversal of 1921401 is 1041291.

It is not a de Polignac number, because 1921401 - 2³ = 1921393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1921481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3711 + ... + 4196.

It is an arithmetic number, because the mean of its divisors is an integer number (239876).

2^1921401 is an apocalyptic number.

It is an amenable number.

1921401 is a deficient number, since it is larger than the sum of its proper divisors (957111).

1921401 is an frugal number, since it uses more digits than its factorization.

1921401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7922 (or 7910 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1921401 is about 1386.1460961962. The cubic root of 1921401 is about 124.3195236710.

Adding to 1921401 its reverse (1041291), we get a palindrome (2962692).

The spelling of 1921401 in words is "one million, nine hundred twenty-one thousand, four hundred one".