1371605 has 8 divisors (see below), whose sum is σ = 1717632. Its totient is φ = 1049488.

The previous prime is 1371599. The next prime is 1371607. The reversal of 1371605 is 5061731.

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

It is a cyclic number.

It is not a de Polignac number, because 1371605 - 2⁴ = 1371589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1371607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5849 + ... + 6078.

It is an arithmetic number, because the mean of its divisors is an integer number (214704).

2^1371605 is an apocalyptic number.

It is an amenable number.

1371605 is a deficient number, since it is larger than the sum of its proper divisors (346027).

1371605 is a wasteful number, since it uses less digits than its factorization.

1371605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11955.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 1371605 is about 1171.1554124026. The cubic root of 1371605 is about 111.1074089507.

The spelling of 1371605 in words is "one million, three hundred seventy-one thousand, six hundred five".