1188431420 has 48 divisors (see below), whose sum is σ = 2785926528. Its totient is φ = 422103360.

The previous prime is 1188431401. The next prime is 1188431429. The reversal of 1188431420 is 241348811.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188431429) 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, 53354 + ... + 72273.

It is an arithmetic number, because the mean of its divisors is an integer number (58040136).

Almost surely, 2^1188431420 is an apocalyptic number.

1188431420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1188431420 is an abundant number, since it is smaller than the sum of its proper divisors (1597495108).

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

1188431420 is a wasteful number, since it uses less digits than its factorization.

1188431420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125690 (or 125688 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 1188431420 is about 34473.6336930124. The cubic root of 1188431420 is about 1059.2326890280.

The spelling of 1188431420 in words is "one billion, one hundred eighty-eight million, four hundred thirty-one thousand, four hundred twenty".