256629398 has 8 divisors (see below), whose sum is σ = 386939208. Its totient is φ = 127649664.

The previous prime is 256629397. The next prime is 256629403. The reversal of 256629398 is 893926652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256629397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332036 + ... + 332807.

It is an arithmetic number, because the mean of its divisors is an integer number (48367401).

Almost surely, 2^256629398 is an apocalyptic number.

256629398 is a deficient number, since it is larger than the sum of its proper divisors (130309810).

256629398 is a wasteful number, since it uses less digits than its factorization.

256629398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665038.

The product of its digits is 1399680, while the sum is 50.

The square root of 256629398 is about 16019.6566130489. The cubic root of 256629398 is about 635.4803631659.

The spelling of 256629398 in words is "two hundred fifty-six million, six hundred twenty-nine thousand, three hundred ninety-eight".