1213745 has 16 divisors (see below), whose sum is σ = 1596672. Its totient is φ = 880320.

The previous prime is 1213741. The next prime is 1213747. The reversal of 1213745 is 5473121.

It is not a de Polignac number, because 1213745 - 2² = 1213741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213745.

It is not an unprimeable number, because it can be changed into a prime (1213741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4484 + ... + 4746.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2^1213745 is an apocalyptic number.

It is an amenable number.

1213745 is a deficient number, since it is larger than the sum of its proper divisors (382927).

1213745 is a wasteful number, since it uses less digits than its factorization.

1213745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its digits is 840, while the sum is 23.

The square root of 1213745 is about 1101.7009576105. The cubic root of 1213745 is about 106.6700465509.

Adding to 1213745 its reverse (5473121), we get a palindrome (6686866).

The spelling of 1213745 in words is "one million, two hundred thirteen thousand, seven hundred forty-five".