255405997 has 8 divisors (see below), whose sum is σ = 318428352. Its totient is φ = 199017600.

The previous prime is 255405991. The next prime is 255406003. The reversal of 255405997 is 799504552.

It is an interprime number because it is at equal distance from previous prime (255405991) and next prime (255406003).

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 255405997 - 2³ = 255405989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255405991) 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, 1658404 + ... + 1658557.

It is an arithmetic number, because the mean of its divisors is an integer number (39803544).

Almost surely, 2^255405997 is an apocalyptic number.

It is an amenable number.

255405997 is a deficient number, since it is larger than the sum of its proper divisors (63022355).

255405997 is a wasteful number, since it uses less digits than its factorization.

255405997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316979.

The product of its (nonzero) digits is 567000, while the sum is 46.

The square root of 255405997 is about 15981.4266259305. The cubic root of 255405997 is about 634.4689357754.

The spelling of 255405997 in words is "two hundred fifty-five million, four hundred five thousand, nine hundred ninety-seven".