621086399 has 8 divisors (see below), whose sum is σ = 623799792. Its totient is φ = 618379840.

The previous prime is 621086377. The next prime is 621086413. The reversal of 621086399 is 993680126.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621086399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621086339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258347 + ... + 260739.

It is an arithmetic number, because the mean of its divisors is an integer number (77974974).

Almost surely, 2^621086399 is an apocalyptic number.

621086399 is a deficient number, since it is larger than the sum of its proper divisors (2713393).

621086399 is a wasteful number, since it uses less digits than its factorization.

621086399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 621086399 is about 24921.6050646823. The cubic root of 621086399 is about 853.1996585077.

The spelling of 621086399 in words is "six hundred twenty-one million, eighty-six thousand, three hundred ninety-nine".