1378520417 has 4 divisors (see below), whose sum is σ = 1392169236. Its totient is φ = 1364871600.

The previous prime is 1378520413. The next prime is 1378520443. The reversal of 1378520417 is 7140258731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1023424081 + 355096336 = 31991^2 + 18844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378520417 - 2² = 1378520413 is a prime.

It is a super-4 number, since 4×1378520417⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378520411) 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, 6824258 + ... + 6824459.

It is an arithmetic number, because the mean of its divisors is an integer number (348042309).

Almost surely, 2^1378520417 is an apocalyptic number.

It is an amenable number.

1378520417 is a deficient number, since it is larger than the sum of its proper divisors (13648819).

1378520417 is a wasteful number, since it uses less digits than its factorization.

1378520417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13648818.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 1378520417 is about 37128.4313835099. The cubic root of 1378520417 is about 1112.9382471005.

The spelling of 1378520417 in words is "one billion, three hundred seventy-eight million, five hundred twenty thousand, four hundred seventeen".