621386 has 4 divisors (see below), whose sum is σ = 932082. Its totient is φ = 310692.

The previous prime is 621371. The next prime is 621389. The reversal of 621386 is 683126.

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

It can be written as a sum of positive squares in only one way, i.e., 534361 + 87025 = 731^2 + 295^2 .

It is a super-2 number, since 2×621386² = 772241121992, which contains 22 as substring.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621386.

It is not an unprimeable number, because it can be changed into a prime (621389) 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 as a sum of consecutive naturals, namely, 155345 + ... + 155348.

2⁶²¹³⁸⁶ is an apocalyptic number.

621386 is a deficient number, since it is larger than the sum of its proper divisors (310696).

621386 is a wasteful number, since it uses less digits than its factorization.

621386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310695.

The product of its digits is 1728, while the sum is 26.

The square root of 621386 is about 788.2804069619. The cubic root of 621386 is about 85.3336825886. Note that the first 3 decimals are identical.

The spelling of 621386 in words is "six hundred twenty-one thousand, three hundred eighty-six".