625438237 has 4 divisors (see below), whose sum is σ = 645613696. Its totient is φ = 605262780.

The previous prime is 625438223. The next prime is 625438243. The reversal of 625438237 is 732834526.

625438237 is nontrivially palindromic in base 5.

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: 732834526 = 2 ⋅366417263.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625438237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 625438237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625438217) 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, 10087683 + ... + 10087744.

It is an arithmetic number, because the mean of its divisors is an integer number (161403424).

Almost surely, 2^625438237 is an apocalyptic number.

It is an amenable number.

625438237 is a deficient number, since it is larger than the sum of its proper divisors (20175459).

625438237 is a wasteful number, since it uses less digits than its factorization.

625438237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20175458.

The product of its digits is 241920, while the sum is 40.

The square root of 625438237 is about 25008.7632041251. The cubic root of 625438237 is about 855.1877599113.

The spelling of 625438237 in words is "six hundred twenty-five million, four hundred thirty-eight thousand, two hundred thirty-seven".