387133213 has 4 divisors (see below), whose sum is σ = 387184348. Its totient is φ = 387082080.

The previous prime is 387133199. The next prime is 387133223. The reversal of 387133213 is 312331783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 369677529 + 17455684 = 19227^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 387133213 - 2⁵ = 387133181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387133223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11706 + ... + 30187.

It is an arithmetic number, because the mean of its divisors is an integer number (96796087).

Almost surely, 2^387133213 is an apocalyptic number.

It is an amenable number.

387133213 is a deficient number, since it is larger than the sum of its proper divisors (51135).

387133213 is an equidigital number, since it uses as much as digits as its factorization.

387133213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51134.

The product of its digits is 9072, while the sum is 31.

The square root of 387133213 is about 19675.7010802665. The cubic root of 387133213 is about 728.8197686195.

Adding to 387133213 its reverse (312331783), we get a palindrome (699464996).

The spelling of 387133213 in words is "three hundred eighty-seven million, one hundred thirty-three thousand, two hundred thirteen".