1240551 has 24 divisors (see below), whose sum is σ = 2018016. Its totient is φ = 728640.

The previous prime is 1240543. The next prime is 1240553. The reversal of 1240551 is 1550421.

It is not a de Polignac number, because 1240551 - 2³ = 1240543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240553) 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, 2461 + ... + 2921.

It is an arithmetic number, because the mean of its divisors is an integer number (84084).

2^1240551 is an apocalyptic number.

1240551 is a deficient number, since it is larger than the sum of its proper divisors (777465).

1240551 is a wasteful number, since it uses less digits than its factorization.

1240551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1240551 is about 1113.8002513916. The cubic root of 1240551 is about 107.4496176384.

Adding to 1240551 its reverse (1550421), we get a palindrome (2790972).

The spelling of 1240551 in words is "one million, two hundred forty thousand, five hundred fifty-one".