402213231 has 24 divisors (see below), whose sum is σ = 668831904. Its totient is φ = 228153600.

The previous prime is 402213211. The next prime is 402213233. The reversal of 402213231 is 132312204.

It is not a de Polignac number, because 402213231 - 2¹⁸ = 401951087 is a prime.

It is a super-2 number, since 2×402213231² = 323550966382918722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402213233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14670 + ... + 31931.

It is an arithmetic number, because the mean of its divisors is an integer number (27867996).

Almost surely, 2^402213231 is an apocalyptic number.

402213231 is a deficient number, since it is larger than the sum of its proper divisors (266618673).

402213231 is a wasteful number, since it uses less digits than its factorization.

402213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46751 (or 46748 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 402213231 is about 20055.2544486476. The cubic root of 402213231 is about 738.1627364921.

Adding to 402213231 its reverse (132312204), we get a palindrome (534525435).

The spelling of 402213231 in words is "four hundred two million, two hundred thirteen thousand, two hundred thirty-one".