1381655 has 8 divisors (see below), whose sum is σ = 1808784. Its totient is φ = 1004800.

The previous prime is 1381649. The next prime is 1381693. The reversal of 1381655 is 5561831.

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-1381655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12506 + ... + 12615.

It is an arithmetic number, because the mean of its divisors is an integer number (226098).

2^1381655 is an apocalyptic number.

1381655 is a deficient number, since it is larger than the sum of its proper divisors (427129).

1381655 is a wasteful number, since it uses less digits than its factorization.

1381655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25137.

The product of its digits is 3600, while the sum is 29.

The square root of 1381655 is about 1175.4382161560. The cubic root of 1381655 is about 111.3781169311.

The spelling of 1381655 in words is "one million, three hundred eighty-one thousand, six hundred fifty-five".