402451 has 4 divisors (see below), whose sum is σ = 459952. Its totient is φ = 344952.

The previous prime is 402443. The next prime is 402487. The reversal of 402451 is 154204.

402451 = 163² + 164² + ... + 176².

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

It is a cyclic number.

It is not a de Polignac number, because 402451 - 2³ = 402443 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402551) 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, 28740 + ... + 28753.

It is an arithmetic number, because the mean of its divisors is an integer number (114988).

2⁴⁰²⁴⁵¹ is an apocalyptic number.

402451 is a deficient number, since it is larger than the sum of its proper divisors (57501).

402451 is an equidigital number, since it uses as much as digits as its factorization.

402451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57500.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 402451 is about 634.3902584372. The cubic root of 402451 is about 73.8308163203.

Adding to 402451 its reverse (154204), we get a palindrome (556655).

The spelling of 402451 in words is "four hundred two thousand, four hundred fifty-one".