255400402 has 4 divisors (see below), whose sum is σ = 383100606. Its totient is φ = 127700200.

The previous prime is 255400373. The next prime is 255400447. The reversal of 255400402 is 204004552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 129982801 + 125417601 = 11401^2 + 11199^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63850099 + ... + 63850102.

Almost surely, 2^255400402 is an apocalyptic number.

255400402 is a deficient number, since it is larger than the sum of its proper divisors (127700204).

255400402 is a wasteful number, since it uses less digits than its factorization.

255400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127700203.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 255400402 is about 15981.2515780210. The cubic root of 255400402 is about 634.4643027863.

Adding to 255400402 its reverse (204004552), we get a palindrome (459404954).

The spelling of 255400402 in words is "two hundred fifty-five million, four hundred thousand, four hundred two".