1240434021 has 8 divisors (see below), whose sum is σ = 1663152480. Its totient is φ = 822335792.

The previous prime is 1240434017. The next prime is 1240434059. The reversal of 1240434021 is 1204340421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240434021 - 2² = 1240434017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240434521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154430 + ... + 1155503.

It is an arithmetic number, because the mean of its divisors is an integer number (207894060).

Almost surely, 2^1240434021 is an apocalyptic number.

It is an amenable number.

1240434021 is a deficient number, since it is larger than the sum of its proper divisors (422718459).

1240434021 is a wasteful number, since it uses less digits than its factorization.

1240434021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310115.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1240434021 is about 35219.7958682330. The cubic root of 1240434021 is about 1074.4624017572.

Adding to 1240434021 its reverse (1204340421), we get a palindrome (2444774442).

The spelling of 1240434021 in words is "one billion, two hundred forty million, four hundred thirty-four thousand, twenty-one".