231402220 has 24 divisors (see below), whose sum is σ = 555365664. Its totient is φ = 79337856.

The previous prime is 231402217. The next prime is 231402233. The reversal of 231402220 is 22204132.

It is a junction number, because it is equal to n+sod(n) for n = 231402194 and 231402203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826297 + ... + 826576.

It is an arithmetic number, because the mean of its divisors is an integer number (23140236).

Almost surely, 2^231402220 is an apocalyptic number.

231402220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231402220 is an abundant number, since it is smaller than the sum of its proper divisors (323963444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231402220 is a wasteful number, since it uses less digits than its factorization.

231402220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652889 (or 1652887 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 231402220 is about 15211.9104651585. The cubic root of 231402220 is about 613.9351613425.

Adding to 231402220 its reverse (22204132), we get a palindrome (253606352).

The spelling of 231402220 in words is "two hundred thirty-one million, four hundred two thousand, two hundred twenty".