1387063021 has 4 divisors (see below), whose sum is σ = 1390992732. Its totient is φ = 1383133312.

The previous prime is 1387063019. The next prime is 1387063033. The reversal of 1387063021 is 1203607831.

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 592386921 + 794676100 = 24339^2 + 28190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387063021 - 2¹ = 1387063019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387063081) 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, 1964326 + ... + 1965031.

It is an arithmetic number, because the mean of its divisors is an integer number (347748183).

Almost surely, 2^1387063021 is an apocalyptic number.

It is an amenable number.

1387063021 is a deficient number, since it is larger than the sum of its proper divisors (3929711).

1387063021 is an equidigital number, since it uses as much as digits as its factorization.

1387063021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929710.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1387063021 is about 37243.2949804391. The cubic root of 1387063021 is about 1115.2324506146.

The spelling of 1387063021 in words is "one billion, three hundred eighty-seven million, sixty-three thousand, twenty-one".