1255400321 has 8 divisors (see below), whose sum is σ = 1436722560. Its totient is φ = 1074572928.

The previous prime is 1255400317. The next prime is 1255400353. The reversal of 1255400321 is 1230045521.

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 1255400321 - 2² = 1255400317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255400021) 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, 118256 + ... + 128433.

It is an arithmetic number, because the mean of its divisors is an integer number (179590320).

Almost surely, 2^1255400321 is an apocalyptic number.

It is an amenable number.

1255400321 is a deficient number, since it is larger than the sum of its proper divisors (181322239).

1255400321 is an equidigital number, since it uses as much as digits as its factorization.

1255400321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247423.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1255400321 is about 35431.6288222825. The cubic root of 1255400321 is about 1078.7664015656.

Adding to 1255400321 its reverse (1230045521), we get a palindrome (2485445842).

The spelling of 1255400321 in words is "one billion, two hundred fifty-five million, four hundred thousand, three hundred twenty-one".