1240723421 has 8 divisors (see below), whose sum is σ = 1418280384. Its totient is φ = 1063244160.

The previous prime is 1240723417. The next prime is 1240723459. The reversal of 1240723421 is 1243270421.

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 1240723421 - 2² = 1240723417 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 (1240723021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20186 + ... + 53748.

It is an arithmetic number, because the mean of its divisors is an integer number (177285048).

Almost surely, 2^1240723421 is an apocalyptic number.

It is an amenable number.

1240723421 is a deficient number, since it is larger than the sum of its proper divisors (177556963).

1240723421 is an equidigital number, since it uses as much as digits as its factorization.

1240723421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38851.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 1240723421 is about 35223.9041135420. The cubic root of 1240723421 is about 1074.5459545661.

Adding to 1240723421 its reverse (1243270421), we get a palindrome (2483993842).

The spelling of 1240723421 in words is "one billion, two hundred forty million, seven hundred twenty-three thousand, four hundred twenty-one".