1445188420 has 24 divisors (see below), whose sum is σ = 3268349784. Its totient is φ = 533607936.

The previous prime is 1445188397. The next prime is 1445188453. The reversal of 1445188420 is 248815441.

It can be written as a sum of positive squares in 4 ways, for example, as 24049216 + 1421139204 = 4904^2 + 37698^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1445188420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2778949 + ... + 2779468.

It is an arithmetic number, because the mean of its divisors is an integer number (136181241).

Almost surely, 2^1445188420 is an apocalyptic number.

1445188420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1445188420 is an abundant number, since it is smaller than the sum of its proper divisors (1823161364).

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

1445188420 is a wasteful number, since it uses less digits than its factorization.

1445188420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558439 (or 5558437 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 37.

The square root of 1445188420 is about 38015.6338892304. The cubic root of 1445188420 is about 1130.5978562903.

The spelling of 1445188420 in words is "one billion, four hundred forty-five million, one hundred eighty-eight thousand, four hundred twenty".