188420420 has 24 divisors (see below), whose sum is σ = 405335448. Its totient is φ = 73529600.

The previous prime is 188420417. The next prime is 188420423. The reversal of 188420420 is 24024881.

It is an interprime number because it is at equal distance from previous prime (188420417) and next prime (188420423).

It can be written as a sum of positive squares in 4 ways, for example, as 2534464 + 185885956 = 1592^2 + 13634^2 .

It is not an unprimeable number, because it can be changed into a prime (188420423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114071 + ... + 115710.

It is an arithmetic number, because the mean of its divisors is an integer number (16888977).

Almost surely, 2^188420420 is an apocalyptic number.

188420420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188420420 is an abundant number, since it is smaller than the sum of its proper divisors (216915028).

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

188420420 is a wasteful number, since it uses less digits than its factorization.

188420420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229831 (or 229829 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 188420420 is about 13726.6317791365. The cubic root of 188420420 is about 573.2921421942.

The spelling of 188420420 in words is "one hundred eighty-eight million, four hundred twenty thousand, four hundred twenty".