621854 has 4 divisors (see below), whose sum is σ = 932784. Its totient is φ = 310926.

The previous prime is 621833. The next prime is 621869. The reversal of 621854 is 458126.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155462 + ... + 155465.

It is an arithmetic number, because the mean of its divisors is an integer number (233196).

2⁶²¹⁸⁵⁴ is an apocalyptic number.

621854 is a deficient number, since it is larger than the sum of its proper divisors (310930).

621854 is a wasteful number, since it uses less digits than its factorization.

621854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310929.

The product of its digits is 1920, while the sum is 26.

The square root of 621854 is about 788.5771997718. The cubic root of 621854 is about 85.3551003770.

The spelling of 621854 in words is "six hundred twenty-one thousand, eight hundred fifty-four".