538623391 has 8 divisors (see below), whose sum is σ = 545243600. Its totient is φ = 532033920.

The previous prime is 538623377. The next prime is 538623401. The reversal of 538623391 is 193326835.

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

It is a cyclic number.

It is not a de Polignac number, because 538623391 - 2²⁷ = 404405663 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 (538623311) 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, 28615 + ... + 43543.

It is an arithmetic number, because the mean of its divisors is an integer number (68155450).

Almost surely, 2^538623391 is an apocalyptic number.

538623391 is a deficient number, since it is larger than the sum of its proper divisors (6620209).

538623391 is a wasteful number, since it uses less digits than its factorization.

538623391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15369.

The product of its digits is 116640, while the sum is 40.

The square root of 538623391 is about 23208.2612661957. The cubic root of 538623391 is about 813.6327161800.

The spelling of 538623391 in words is "five hundred thirty-eight million, six hundred twenty-three thousand, three hundred ninety-one".