1387637501389 has 4 divisors (see below), whose sum is σ = 1388308183740. Its totient is φ = 1386966819040.

The previous prime is 1387637501363. The next prime is 1387637501407. The reversal of 1387637501389 is 9831057367831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 939654932164 + 447982569225 = 969358^2 + 669315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387637501389 - 2⁹ = 1387637500877 is a prime.

It is a super-2 number, since 2×1387637501389² (a number of 25 digits) 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 (1387637501359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335338072 + ... + 335342209.

It is an arithmetic number, because the mean of its divisors is an integer number (347077045935).

Almost surely, 2^{1387637501389} is an apocalyptic number.

It is an amenable number.

1387637501389 is a deficient number, since it is larger than the sum of its proper divisors (670682351).

1387637501389 is an equidigital number, since it uses as much as digits as its factorization.

1387637501389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670682350.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 1387637501389 in words is "one trillion, three hundred eighty-seven billion, six hundred thirty-seven million, five hundred one thousand, three hundred eighty-nine".