1201645 has 16 divisors (see below), whose sum is σ = 1556928. Its totient is φ = 887040.

The previous prime is 1201643. The next prime is 1201687. The reversal of 1201645 is 5461021.

It is not a de Polignac number, because 1201645 - 2¹ = 1201643 is a prime.

It is a super-3 number, since 3×1201645³ = 5205348438424233375, which contains 333 as substring.

1201645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201643) 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, 5590 + ... + 5800.

It is an arithmetic number, because the mean of its divisors is an integer number (97308).

2^1201645 is an apocalyptic number.

It is an amenable number.

1201645 is a deficient number, since it is larger than the sum of its proper divisors (355283).

1201645 is a wasteful number, since it uses less digits than its factorization.

1201645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1201645 is about 1096.1956942079. The cubic root of 1201645 is about 106.3143923400.

Adding to 1201645 its reverse (5461021), we get a palindrome (6662666).

The spelling of 1201645 in words is "one million, two hundred one thousand, six hundred forty-five".