1387631259 has 12 divisors (see below), whose sum is σ = 2290692976. Its totient is φ = 792932112.

The previous prime is 1387631257. The next prime is 1387631279. The reversal of 1387631259 is 9521367831.

1387631259 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 631 + 2 + 5 + 9 = 666.

It is not a de Polignac number, because 1387631259 - 2¹ = 1387631257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387631257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11012884 + ... + 11013009.

Almost surely, 2^1387631259 is an apocalyptic number.

1387631259 is a deficient number, since it is larger than the sum of its proper divisors (903061717).

1387631259 is a wasteful number, since it uses less digits than its factorization.

1387631259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22025906 (or 22025903 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1387631259 is about 37250.9229281638. The cubic root of 1387631259 is about 1115.3847222199.

The spelling of 1387631259 in words is "one billion, three hundred eighty-seven million, six hundred thirty-one thousand, two hundred fifty-nine".