378997540 has 12 divisors (see below), whose sum is σ = 795894876. Its totient is φ = 151599008.

The previous prime is 378997517. The next prime is 378997547. The reversal of 378997540 is 45799873.

It can be written as a sum of positive squares in 2 ways, for example, as 95883264 + 283114276 = 9792^2 + 16826^2 .

It is not an unprimeable number, because it can be changed into a prime (378997547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9474919 + ... + 9474958.

It is an arithmetic number, because the mean of its divisors is an integer number (66324573).

Almost surely, 2^378997540 is an apocalyptic number.

It is an amenable number.

378997540 is an abundant number, since it is smaller than the sum of its proper divisors (416897336).

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

378997540 is a wasteful number, since it uses less digits than its factorization.

378997540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18949886 (or 18949884 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 378997540 is about 19467.8591529731. The cubic root of 378997540 is about 723.6781558418.

The spelling of 378997540 in words is "three hundred seventy-eight million, nine hundred ninety-seven thousand, five hundred forty".