1378750465 has 4 divisors (see below), whose sum is σ = 1654500564. Its totient is φ = 1103000368.

The previous prime is 1378750453. The next prime is 1378750493. The reversal of 1378750465 is 5640578731.

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 1030666816 + 348083649 = 32104^2 + 18657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378750465 - 2¹¹ = 1378748417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137875042 + ... + 137875051.

It is an arithmetic number, because the mean of its divisors is an integer number (413625141).

Almost surely, 2^1378750465 is an apocalyptic number.

It is an amenable number.

1378750465 is a deficient number, since it is larger than the sum of its proper divisors (275750099).

1378750465 is an equidigital number, since it uses as much as digits as its factorization.

1378750465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275750098.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 1378750465 is about 37131.5292574922. The cubic root of 1378750465 is about 1113.0001528399. Note that the first 3 decimals are identical.

The spelling of 1378750465 in words is "one billion, three hundred seventy-eight million, seven hundred fifty thousand, four hundred sixty-five".