402481 has 4 divisors (see below), whose sum is σ = 404212. Its totient is φ = 400752.

The previous prime is 402443. The next prime is 402487. The reversal of 402481 is 184204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 255025 + 147456 = 505^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 402481 - 2¹⁷ = 271409 is a prime.

It is a super-2 number, since 2×402481² = 323981910722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450 + ... + 1003.

It is an arithmetic number, because the mean of its divisors is an integer number (101053).

2⁴⁰²⁴⁸¹ is an apocalyptic number.

It is an amenable number.

402481 is a deficient number, since it is larger than the sum of its proper divisors (1731).

402481 is a wasteful number, since it uses less digits than its factorization.

402481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 402481 is about 634.4139027480. The cubic root of 402481 is about 73.8326508041.

Adding to 402481 its reverse (184204), we get a palindrome (586685).

The spelling of 402481 in words is "four hundred two thousand, four hundred eighty-one".