1240545 has 16 divisors (see below), whose sum is σ = 1999872. Its totient is φ = 656640.

The previous prime is 1240543. The next prime is 1240553. The reversal of 1240545 is 5450421.

It is not a de Polignac number, because 1240545 - 2¹ = 1240543 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1240543) 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, 2649 + ... + 3081.

It is an arithmetic number, because the mean of its divisors is an integer number (124992).

2^1240545 is an apocalyptic number.

1240545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240545 is a deficient number, since it is larger than the sum of its proper divisors (759327).

1240545 is a wasteful number, since it uses less digits than its factorization.

1240545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1240545 is about 1113.7975579072. The cubic root of 1240545 is about 107.4494444092.

Adding to 1240545 its reverse (5450421), we get a palindrome (6690966).

The spelling of 1240545 in words is "one million, two hundred forty thousand, five hundred forty-five".