1378500565 has 16 divisors (see below), whose sum is σ = 1824900336. Its totient is φ = 993139200.

The previous prime is 1378500547. The next prime is 1378500583. The reversal of 1378500565 is 5650058731.

It is an interprime number because it is at equal distance from previous prime (1378500547) and next prime (1378500583).

It can be written as a sum of positive squares in 8 ways, for example, as 591024721 + 787475844 = 24311^2 + 28062^2 .

It is not a de Polignac number, because 1378500565 - 2⁵ = 1378500533 is a prime.

It is a super-4 number, since 4×1378500565⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255966 + ... + 261295.

It is an arithmetic number, because the mean of its divisors is an integer number (114056271).

Almost surely, 2^1378500565 is an apocalyptic number.

It is an amenable number.

1378500565 is a deficient number, since it is larger than the sum of its proper divisors (446399771).

1378500565 is a wasteful number, since it uses less digits than its factorization.

1378500565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517320.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 1378500565 is about 37128.1640402539. The cubic root of 1378500565 is about 1112.9329046198.

The spelling of 1378500565 in words is "one billion, three hundred seventy-eight million, five hundred thousand, five hundred sixty-five".