625399 has 4 divisors (see below), whose sum is σ = 628360. Its totient is φ = 622440.

The previous prime is 625397. The next prime is 625409. The reversal of 625399 is 993526.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993526 = 2 ⋅496763.

It is a cyclic number.

It is not a de Polignac number, because 625399 - 2¹ = 625397 is a prime.

It is a super-2 number, since 2×625399² = 782247818402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625397) 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, 1137 + ... + 1594.

It is an arithmetic number, because the mean of its divisors is an integer number (157090).

2⁶²⁵³⁹⁹ is an apocalyptic number.

625399 is a deficient number, since it is larger than the sum of its proper divisors (2961).

625399 is a wasteful number, since it uses less digits than its factorization.

625399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960.

The product of its digits is 14580, while the sum is 34.

The square root of 625399 is about 790.8217245372. The cubic root of 625399 is about 85.5169876076.

It can be divided in two parts, 625 and 399, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 625399 in words is "six hundred twenty-five thousand, three hundred ninety-nine".