1387207642 has 8 divisors (see below), whose sum is σ = 2088217332. Its totient is φ = 691135200.

The previous prime is 1387207639. The next prime is 1387207681. The reversal of 1387207642 is 2467027831.

It can be written as a sum of positive squares in 2 ways, for example, as 1360798321 + 26409321 = 36889^2 + 5139^2 .

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 = 1387207595 and 1387207604.

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, 1233609 + ... + 1234732.

Almost surely, 2^1387207642 is an apocalyptic number.

1387207642 is a deficient number, since it is larger than the sum of its proper divisors (701009690).

1387207642 is a wasteful number, since it uses less digits than its factorization.

1387207642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468624.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 1387207642 is about 37245.2365007930. The cubic root of 1387207642 is about 1115.2712088697.

The spelling of 1387207642 in words is "one billion, three hundred eighty-seven million, two hundred seven thousand, six hundred forty-two".