1240040451 has 16 divisors (see below), whose sum is σ = 1781214624. Its totient is φ = 762825984.

The previous prime is 1240040443. The next prime is 1240040467. The reversal of 1240040451 is 1540400421.

It is a happy number.

It is not a de Polignac number, because 1240040451 - 2³ = 1240040443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240040411) 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, 177415 + ... + 184271.

It is an arithmetic number, because the mean of its divisors is an integer number (111325914).

Almost surely, 2^1240040451 is an apocalyptic number.

1240040451 is a deficient number, since it is larger than the sum of its proper divisors (541174173).

1240040451 is a wasteful number, since it uses less digits than its factorization.

1240040451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1240040451 is about 35214.2080842378. The cubic root of 1240040451 is about 1074.3487531224.

Adding to 1240040451 its reverse (1540400421), we get a palindrome (2780440872).

The spelling of 1240040451 in words is "one billion, two hundred forty million, forty thousand, four hundred fifty-one".