1387801285 has 16 divisors (see below), whose sum is σ = 1800466416. Its totient is φ = 1020837888.

The previous prime is 1387801279. The next prime is 1387801313. The reversal of 1387801285 is 5821087831.

It can be written as a sum of positive squares in 8 ways, for example, as 5225796 + 1382575489 = 2286^2 + 37183^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387801285 - 2⁵ = 1387801253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24834 + ... + 58243.

It is an arithmetic number, because the mean of its divisors is an integer number (112529151).

Almost surely, 2^1387801285 is an apocalyptic number.

It is an amenable number.

1387801285 is a deficient number, since it is larger than the sum of its proper divisors (412665131).

1387801285 is a wasteful number, since it uses less digits than its factorization.

1387801285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83352.

The product of its (nonzero) digits is 107520, while the sum is 43.

The square root of 1387801285 is about 37253.2050299031. The cubic root of 1387801285 is about 1115.4302762667.

The spelling of 1387801285 in words is "one billion, three hundred eighty-seven million, eight hundred one thousand, two hundred eighty-five".