2231387208 has 108 divisors (see below), whose sum is σ = 6399994185. Its totient is φ = 702243648.

The previous prime is 2231387129. The next prime is 2231387209. The reversal of 2231387208 is 8027831322.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1619418564 + 611968644 = 40242^2 + 24738^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=33402.

It is a super-3 number, since 3×2231387208³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2231387209) 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 26 ways as a sum of consecutive naturals, for example, 7615510 + ... + 7615802.

Almost surely, 2^2231387208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2231387208

2231387208 is an abundant number, since it is smaller than the sum of its proper divisors (4168606977).

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

2231387208 is a wasteful number, since it uses less digits than its factorization.

2231387208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 2231387208 is about 47237.5614103861. The cubic root of 2231387208 is about 1306.7474050602.

The spelling of 2231387208 in words is "two billion, two hundred thirty-one million, three hundred eighty-seven thousand, two hundred eight".