228142387 has 4 divisors (see below), whose sum is σ = 248882616. Its totient is φ = 207402160.

The previous prime is 228142337. The next prime is 228142403. The reversal of 228142387 is 783241822.

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

It is a cyclic number.

It is not a de Polignac number, because 228142387 - 2¹⁹ = 227618099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228142337) 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, 10370098 + ... + 10370119.

It is an arithmetic number, because the mean of its divisors is an integer number (62220654).

Almost surely, 2^228142387 is an apocalyptic number.

228142387 is a deficient number, since it is larger than the sum of its proper divisors (20740229).

228142387 is a wasteful number, since it uses less digits than its factorization.

228142387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20740228.

The product of its digits is 43008, while the sum is 37.

The square root of 228142387 is about 15104.3830393697. The cubic root of 228142387 is about 611.0386202633.

The spelling of 228142387 in words is "two hundred twenty-eight million, one hundred forty-two thousand, three hundred eighty-seven".