626401 has 4 divisors (see below), whose sum is σ = 634032. Its totient is φ = 618772.

The previous prime is 626393. The next prime is 626443. The reversal of 626401 is 104626.

626401 = T₇₉ + T₈₀ + ... + T₁₆₁.

626401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104626 = 2 ⋅52313.

It is a cyclic number.

It is not a de Polignac number, because 626401 - 2³ = 626393 is a prime.

It is a Duffinian number.

626401 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (626201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3691 + ... + 3856.

It is an arithmetic number, because the mean of its divisors is an integer number (158508).

2⁶²⁶⁴⁰¹ is an apocalyptic number.

It is an amenable number.

626401 is a deficient number, since it is larger than the sum of its proper divisors (7631).

626401 is an equidigital number, since it uses as much as digits as its factorization.

626401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7630.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 626401 is about 791.4549892445. The cubic root of 626401 is about 85.5626343599.

The spelling of 626401 in words is "six hundred twenty-six thousand, four hundred one".