619421 has 4 divisors (see below), whose sum is σ = 675744. Its totient is φ = 563100.

The previous prime is 619397. The next prime is 619471. The reversal of 619421 is 124916.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-619421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (619471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28145 + ... + 28166.

It is an arithmetic number, because the mean of its divisors is an integer number (168936).

2⁶¹⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

619421 is a deficient number, since it is larger than the sum of its proper divisors (56323).

619421 is a wasteful number, since it uses less digits than its factorization.

619421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56322.

The product of its digits is 432, while the sum is 23.

The square root of 619421 is about 787.0330361554. The cubic root of 619421 is about 85.2436377808.

The spelling of 619421 in words is "six hundred nineteen thousand, four hundred twenty-one".