1399713779025 has 135 divisors (see below), whose sum is σ = 2642084814369. Its totient is φ = 732572424000.

The previous prime is 1399713779003. The next prime is 1399713779027. The reversal of 1399713779025 is 5209773179931.

The square root of 1399713779025 is 1183095.

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

1399713779025 is a `hidden beast` number, since 1 + 3 + 99 + 71 + 377 + 90 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 644733520209 + 754980258816 = 802953^2 + 868896^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 1399713779025 - 2²¹ = 1399711681873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399713779027) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 3247595560 + ... + 3247595990.

Almost surely, 2^{1399713779025} is an apocalyptic number.

1399713779025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1399713779025 is the 1183095-th square number.

1399713779025 is the 591548-th centered octagonal number.

It is an amenable number.

1399713779025 is a deficient number, since it is larger than the sum of its proper divisors (1242371035344).

1399713779025 is an frugal number, since it uses more digits than its factorization.

1399713779025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 22504230, while the sum is 63.

The spelling of 1399713779025 in words is "one trillion, three hundred ninety-nine billion, seven hundred thirteen million, seven hundred seventy-nine thousand, twenty-five".