1445391378 has 90 divisors (see below), whose sum is σ = 3387161349. Its totient is φ = 460667088.

The previous prime is 1445391377. The next prime is 1445391397. The reversal of 1445391378 is 8731935441.

1445391378 is a `hidden beast` number, since 1 + 44 + 539 + 1 + 3 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1444532049 + 859329 = 38007^2 + 927^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26883.

It is not an unprimeable number, because it can be changed into a prime (1445391373) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 14032875 + ... + 14032977.

Almost surely, 2^1445391378 is an apocalyptic number.

1445391378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1445391378

1445391378 is an abundant number, since it is smaller than the sum of its proper divisors (1941769971).

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

1445391378 is an equidigital number, since it uses as much as digits as its factorization.

1445391378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 137 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1445391378 is about 38018.3031972759. The cubic root of 1445391378 is about 1130.6507797559.

The spelling of 1445391378 in words is "one billion, four hundred forty-five million, three hundred ninety-one thousand, three hundred seventy-eight".