402291 has 6 divisors (see below), whose sum is σ = 581100. Its totient is φ = 268188.

The previous prime is 402277. The next prime is 402299. The reversal of 402291 is 192204.

It is not a de Polignac number, because 402291 - 2¹¹ = 400243 is a prime.

402291 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (402299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22341 + ... + 22358.

It is an arithmetic number, because the mean of its divisors is an integer number (96850).

2⁴⁰²²⁹¹ is an apocalyptic number.

402291 is a deficient number, since it is larger than the sum of its proper divisors (178809).

402291 is a wasteful number, since it uses less digits than its factorization.

402291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44705 (or 44702 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 402291 is about 634.2641405598. The cubic root of 402291 is about 73.8210308670.

Adding to 402291 its reverse (192204), we get a palindrome (594495).

The spelling of 402291 in words is "four hundred two thousand, two hundred ninety-one".