1388680225 has 27 divisors (see below), whose sum is σ = 1790355307. Its totient is φ = 1068462080.

The previous prime is 1388680219. The next prime is 1388680273. The reversal of 1388680225 is 5220868831.

The square root of 1388680225 is 37265.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 79977249 + 1308702976 = 8943^2 + 36176^2 .

It is not a de Polignac number, because 1388680225 - 2⁵ = 1388680193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5403297 + ... + 5403553.

Almost surely, 2^1388680225 is an apocalyptic number.

1388680225 is the 37265-th square number.

1388680225 is the 18633-rd centered octagonal number.

It is an amenable number.

1388680225 is a deficient number, since it is larger than the sum of its proper divisors (401675082).

1388680225 is an frugal number, since it uses more digits than its factorization.

1388680225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The cubic root of 1388680225 is about 1115.6657060788.

The spelling of 1388680225 in words is "one billion, three hundred eighty-eight million, six hundred eighty thousand, two hundred twenty-five".