1240432421 has 4 divisors (see below), whose sum is σ = 1313399052. Its totient is φ = 1167465792.

The previous prime is 1240432397. The next prime is 1240432429. The reversal of 1240432421 is 1242340421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1148464321 + 91968100 = 33889^2 + 9590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240432421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240432429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36483290 + ... + 36483323.

It is an arithmetic number, because the mean of its divisors is an integer number (328349763).

Almost surely, 2^1240432421 is an apocalyptic number.

It is an amenable number.

1240432421 is a deficient number, since it is larger than the sum of its proper divisors (72966631).

1240432421 is an equidigital number, since it uses as much as digits as its factorization.

1240432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72966630.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1240432421 is about 35219.7731537272. The cubic root of 1240432421 is about 1074.4619397844.

Adding to 1240432421 its reverse (1242340421), we get a palindrome (2482772842).

The spelling of 1240432421 in words is "one billion, two hundred forty million, four hundred thirty-two thousand, four hundred twenty-one".