1240746421 has 4 divisors (see below), whose sum is σ = 1245464352. Its totient is φ = 1236028492.

The previous prime is 1240746413. The next prime is 1240746509. The reversal of 1240746421 is 1246470421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240746421 - 2³ = 1240746413 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 (1240740421) 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, 2358571 + ... + 2359096.

It is an arithmetic number, because the mean of its divisors is an integer number (311366088).

Almost surely, 2^1240746421 is an apocalyptic number.

It is an amenable number.

1240746421 is a deficient number, since it is larger than the sum of its proper divisors (4717931).

1240746421 is an equidigital number, since it uses as much as digits as its factorization.

1240746421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717930.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 1240746421 is about 35224.2305948618. The cubic root of 1240746421 is about 1074.5525943495.

The spelling of 1240746421 in words is "one billion, two hundred forty million, seven hundred forty-six thousand, four hundred twenty-one".