1378517625 has 48 divisors (see below), whose sum is σ = 2489499792. Its totient is φ = 733881600.

The previous prime is 1378517599. The next prime is 1378517633. The reversal of 1378517625 is 5267158731.

It is a happy number.

1378517625 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 5 + 17 + 625 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 980754489 + 397763136 = 31317^2 + 19944^2 .

It is not a de Polignac number, because 1378517625 - 2¹² = 1378513529 is a prime.

It is a super-4 number, since 4×1378517625⁴ (a number of 38 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1233567 + ... + 1234683.

It is an arithmetic number, because the mean of its divisors is an integer number (51864579).

Almost surely, 2^1378517625 is an apocalyptic number.

1378517625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378517625 is a deficient number, since it is larger than the sum of its proper divisors (1110982167).

1378517625 is a wasteful number, since it uses less digits than its factorization.

1378517625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235 (or 2222 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 1378517625 is about 37128.3937842724. The cubic root of 1378517625 is about 1112.9374957331.

The spelling of 1378517625 in words is "one billion, three hundred seventy-eight million, five hundred seventeen thousand, six hundred twenty-five".