1315845 has 42 divisors (see below), whose sum is σ = 2498598. Its totient is φ = 664848.

The previous prime is 1315837. The next prime is 1315849. The reversal of 1315845 is 5485131.

It can be written as a sum of positive squares in only one way, i.e., 1052676 + 263169 = 1026^2 + 513^2 .

It is not a de Polignac number, because 1315845 - 2³ = 1315837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315849) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 69246 + ... + 69264.

2^1315845 is an apocalyptic number.

1315845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1315845 is a deficient number, since it is larger than the sum of its proper divisors (1182753).

1315845 is an frugal number, since it uses more digits than its factorization.

1315845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 27 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 1315845 is about 1147.1028724574. The cubic root of 1315845 is about 109.5809122370.

It can be divided in two parts, 13158 and 45, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 1315845 in words is "one million, three hundred fifteen thousand, eight hundred forty-five".