256143400 has 48 divisors (see below), whose sum is σ = 610078140. Its totient is φ = 99955200.

The previous prime is 256143397. The next prime is 256143409. The reversal of 256143400 is 4341652.

It can be written as a sum of positive squares in 6 ways, for example, as 76422564 + 179720836 = 8742^2 + 13406^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256143409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7419 + ... + 23818.

Almost surely, 2^256143400 is an apocalyptic number.

256143400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256143400 is an abundant number, since it is smaller than the sum of its proper divisors (353934740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256143400 is a wasteful number, since it uses less digits than its factorization.

256143400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31294 (or 31285 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 256143400 is about 16004.4806226257. The cubic root of 256143400 is about 635.0789576730.

The spelling of 256143400 in words is "two hundred fifty-six million, one hundred forty-three thousand, four hundred".