1240421451 has 8 divisors (see below), whose sum is σ = 1678580544. Its totient is φ = 814605000.

The previous prime is 1240421447. The next prime is 1240421461. The reversal of 1240421451 is 1541240421.

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

It is not a de Polignac number, because 1240421451 - 2² = 1240421447 is a prime.

It is a super-2 number, since 2×1240421451² = 3077290752201890802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1240421461) 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, 3085425 + ... + 3085826.

It is an arithmetic number, because the mean of its divisors is an integer number (209822568).

Almost surely, 2^1240421451 is an apocalyptic number.

1240421451 is a deficient number, since it is larger than the sum of its proper divisors (438159093).

1240421451 is an equidigital number, since it uses as much as digits as its factorization.

1240421451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6171321.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 1240421451 is about 35219.6174170021. The cubic root of 1240421451 is about 1074.4587723722.

Adding to 1240421451 its reverse (1541240421), we get a palindrome (2781661872).

The spelling of 1240421451 in words is "one billion, two hundred forty million, four hundred twenty-one thousand, four hundred fifty-one".