402651 has 12 divisors (see below), whose sum is σ = 603512. Its totient is φ = 268272.

The previous prime is 402631. The next prime is 402691. The reversal of 402651 is 156204.

It is a happy number.

It is not a de Polignac number, because 402651 - 2⁶ = 402587 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (402601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 586 + ... + 1071.

2⁴⁰²⁶⁵¹ is an apocalyptic number.

402651 is a deficient number, since it is larger than the sum of its proper divisors (200861).

402651 is an equidigital number, since it uses as much as digits as its factorization.

402651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 402651 is about 634.5478705346. The cubic root of 402651 is about 73.8430444905.

Adding to 402651 its reverse (156204), we get a palindrome (558855).

The spelling of 402651 in words is "four hundred two thousand, six hundred fifty-one".