1378427625 has 80 divisors (see below), whose sum is σ = 2595450000. Its totient is φ = 727833600.

The previous prime is 1378427591. The next prime is 1378427641. The reversal of 1378427625 is 5267248731.

1378427625 is a `hidden beast` number, since 1 + 378 + 4 + 276 + 2 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 376515216 + 1001912409 = 19404^2 + 31653^2 .

It is not a de Polignac number, because 1378427625 - 2¹⁴ = 1378411241 is a prime.

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

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 79 ways as a sum of consecutive naturals, for example, 1103001 + ... + 1104249.

It is an arithmetic number, because the mean of its divisors is an integer number (32443125).

Almost surely, 2^1378427625 is an apocalyptic number.

1378427625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378427625 is a deficient number, since it is larger than the sum of its proper divisors (1217022375).

1378427625 is a wasteful number, since it uses less digits than its factorization.

1378427625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385 (or 1366 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 1378427625 is about 37127.1817540734. The cubic root of 1378427625 is about 1112.9132748955.

The spelling of 1378427625 in words is "one billion, three hundred seventy-eight million, four hundred twenty-seven thousand, six hundred twenty-five".