228400437 has 4 divisors (see below), whose sum is σ = 304533920. Its totient is φ = 152266956.

The previous prime is 228400427. The next prime is 228400439. The reversal of 228400437 is 734004822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228400437 - 2¹⁹ = 227876149 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 (228400439) 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, 38066737 + ... + 38066742.

It is an arithmetic number, because the mean of its divisors is an integer number (76133480).

Almost surely, 2^228400437 is an apocalyptic number.

It is an amenable number.

228400437 is a deficient number, since it is larger than the sum of its proper divisors (76133483).

228400437 is an equidigital number, since it uses as much as digits as its factorization.

228400437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76133482.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 228400437 is about 15112.9228476824. The cubic root of 228400437 is about 611.2689137301.

The spelling of 228400437 in words is "two hundred twenty-eight million, four hundred thousand, four hundred thirty-seven".