1378491457 has 8 divisors (see below), whose sum is σ = 1580798016. Its totient is φ = 1177529712.

The previous prime is 1378491449. The next prime is 1378491509. The reversal of 1378491457 is 7541948731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1378491457 - 2³ = 1378491449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378491457.

It is not an unprimeable number, because it can be changed into a prime (1378491437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334003 + ... + 338104.

It is an arithmetic number, because the mean of its divisors is an integer number (197599752).

Almost surely, 2^1378491457 is an apocalyptic number.

It is an amenable number.

1378491457 is a deficient number, since it is larger than the sum of its proper divisors (202306559).

1378491457 is an equidigital number, since it uses as much as digits as its factorization.

1378491457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672407.

The product of its digits is 846720, while the sum is 49.

The square root of 1378491457 is about 37128.0413838382. The cubic root of 1378491457 is about 1112.9304534987.

The spelling of 1378491457 in words is "one billion, three hundred seventy-eight million, four hundred ninety-one thousand, four hundred fifty-seven".