1387557242 has 8 divisors (see below), whose sum is σ = 2093799456. Its totient is φ = 689624092.

The previous prime is 1387557233. The next prime is 1387557253. The reversal of 1387557242 is 2427557831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1387557193 and 1387557202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2076848 + ... + 2077515.

It is an arithmetic number, because the mean of its divisors is an integer number (261724932).

Almost surely, 2^1387557242 is an apocalyptic number.

1387557242 is a deficient number, since it is larger than the sum of its proper divisors (706242214).

1387557242 is a wasteful number, since it uses less digits than its factorization.

1387557242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154532.

The product of its digits is 470400, while the sum is 44.

The square root of 1387557242 is about 37249.9294227519. The cubic root of 1387557242 is about 1115.3648901264.

It can be divided in two parts, 13875 and 57242, that added together give a palindrome (71117).

The spelling of 1387557242 in words is "one billion, three hundred eighty-seven million, five hundred fifty-seven thousand, two hundred forty-two".