228191397 has 16 divisors (see below), whose sum is σ = 347965440. Its totient is φ = 130303152.

The previous prime is 228191377. The next prime is 228191399. The reversal of 228191397 is 793191822.

It is not a de Polignac number, because 228191397 - 2⁶ = 228191333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228191399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36568 + ... + 42350.

It is an arithmetic number, because the mean of its divisors is an integer number (21747840).

Almost surely, 2^228191397 is an apocalyptic number.

It is an amenable number.

228191397 is a deficient number, since it is larger than the sum of its proper divisors (119774043).

228191397 is a wasteful number, since it uses less digits than its factorization.

228191397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672.

The product of its digits is 54432, while the sum is 42.

The square root of 228191397 is about 15106.0053290074. The cubic root of 228191397 is about 611.0823719732.

The spelling of 228191397 in words is "two hundred twenty-eight million, one hundred ninety-one thousand, three hundred ninety-seven".