621857254 has 4 divisors (see below), whose sum is σ = 932785884. Its totient is φ = 310928626.

The previous prime is 621857221. The next prime is 621857267. The reversal of 621857254 is 452758126.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 155464312 + ... + 155464315.

It is an arithmetic number, because the mean of its divisors is an integer number (233196471).

Almost surely, 2^621857254 is an apocalyptic number.

621857254 is a deficient number, since it is larger than the sum of its proper divisors (310928630).

621857254 is a wasteful number, since it uses less digits than its factorization.

621857254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310928629.

The product of its digits is 134400, while the sum is 40.

The square root of 621857254 is about 24937.0658658953. The cubic root of 621857254 is about 853.5524925712.

The spelling of 621857254 in words is "six hundred twenty-one million, eight hundred fifty-seven thousand, two hundred fifty-four".