1913421 has 8 divisors (see below), whose sum is σ = 2557984. Its totient is φ = 1272240.

The previous prime is 1913419. The next prime is 1913437. The reversal of 1913421 is 1243191.

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

It is not a de Polignac number, because 1913421 - 2¹ = 1913419 is a prime.

It is a super-2 number, since 2×1913421² = 7322359846482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

1913421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913441) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1155 + ... + 2271.

It is an arithmetic number, because the mean of its divisors is an integer number (319748).

2^1913421 is an apocalyptic number.

It is an amenable number.

1913421 is a deficient number, since it is larger than the sum of its proper divisors (644563).

1913421 is a wasteful number, since it uses less digits than its factorization.

1913421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691.

The product of its digits is 216, while the sum is 21.

The square root of 1913421 is about 1383.2646167672. The cubic root of 1913421 is about 124.1471760968.

The spelling of 1913421 in words is "one million, nine hundred thirteen thousand, four hundred twenty-one".