1240605 has 24 divisors (see below), whose sum is σ = 2265120. Its totient is φ = 626400.

The previous prime is 1240559. The next prime is 1240607. The reversal of 1240605 is 5060421.

It is a happy number.

It is not a de Polignac number, because 1240605 - 2¹⁷ = 1109533 is a prime.

It is a super-3 number, since 3×1240605³ = 5728248317503335375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130 + ... + 1580.

It is an arithmetic number, because the mean of its divisors is an integer number (94380).

2^1240605 is an apocalyptic number.

1240605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240605 is a deficient number, since it is larger than the sum of its proper divisors (1024515).

1240605 is a wasteful number, since it uses less digits than its factorization.

1240605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1240605 is about 1113.8244924583. The cubic root of 1240605 is about 107.4511766755.

The spelling of 1240605 in words is "one million, two hundred forty thousand, six hundred five".