621401 has 8 divisors (see below), whose sum is σ = 717984. Its totient is φ = 531520.

The previous prime is 621389. The next prime is 621419. The reversal of 621401 is 104126.

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

It is not a de Polignac number, because 621401 - 2⁶ = 621337 is a prime.

It is a super-2 number, since 2×621401² = 772278405602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621401.

It is not an unprimeable number, because it can be changed into a prime (621431) 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, 1475 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (89748).

2⁶²¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

621401 is a deficient number, since it is larger than the sum of its proper divisors (96583).

621401 is a wasteful number, since it uses less digits than its factorization.

621401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 621401 is about 788.2899212853. The cubic root of 621401 is about 85.3343692230.

Adding to 621401 its reverse (104126), we get a palindrome (725527).

The spelling of 621401 in words is "six hundred twenty-one thousand, four hundred one".