1387653641 has 8 divisors (see below), whose sum is σ = 1579621824. Its totient is φ = 1206655120.

The previous prime is 1387653629. The next prime is 1387653649. The reversal of 1387653641 is 1463567831.

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

It is a de Polignac number, because none of the positive numbers 2^k-1387653641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1387653592 and 1387653601.

It is not an unprimeable number, because it can be changed into a prime (1387653649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2742146 + ... + 2742651.

It is an arithmetic number, because the mean of its divisors is an integer number (197452728).

Almost surely, 2^1387653641 is an apocalyptic number.

1387653641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1387653641 is a deficient number, since it is larger than the sum of its proper divisors (191968183).

1387653641 is a wasteful number, since it uses less digits than its factorization.

1387653641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484831.

The product of its digits is 362880, while the sum is 44.

The square root of 1387653641 is about 37251.2233490392. The cubic root of 1387653641 is about 1115.3907191077.

The spelling of 1387653641 in words is "one billion, three hundred eighty-seven million, six hundred fifty-three thousand, six hundred forty-one".