1385642725 has 12 divisors (see below), whose sum is σ = 1733405796. Its totient is φ = 1098702080.

The previous prime is 1385642719. The next prime is 1385642729. The reversal of 1385642725 is 5272465831.

1385642725 = 26321² + 26322².

It can be written as a sum of positive squares in 6 ways, for example, as 510488836 + 875153889 = 22594^2 + 29583^2 .

It is not a de Polignac number, because 1385642725 - 2³ = 1385642717 is a prime.

It is a super-2 number, since 2×1385642725² = 3840011522690851250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385642729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242422 + ... + 248071.

It is an arithmetic number, because the mean of its divisors is an integer number (144450483).

Almost surely, 2^1385642725 is an apocalyptic number.

1385642725 is the 26322-nd centered square number.

It is an amenable number.

1385642725 is a deficient number, since it is larger than the sum of its proper divisors (347763071).

1385642725 is a wasteful number, since it uses less digits than its factorization.

1385642725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490616 (or 490611 counting only the distinct ones).

The product of its digits is 403200, while the sum is 43.

The square root of 1385642725 is about 37224.2222887195. Note that the first 4 decimals coincide. The cubic root of 1385642725 is about 1114.8516697586.

The spelling of 1385642725 in words is "one billion, three hundred eighty-five million, six hundred forty-two thousand, seven hundred twenty-five".