1240420311 has 20 divisors (see below), whose sum is σ = 1995511672. Its totient is φ = 763334928.

The previous prime is 1240420297. The next prime is 1240420343. The reversal of 1240420311 is 1130240421.

1240420311 is a `hidden beast` number, since 1 + 240 + 420 + 3 + 1 + 1 = 666.

It is not a de Polignac number, because 1240420311 - 2¹³ = 1240412119 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 (1240420361) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 587941 + ... + 590046.

Almost surely, 2^1240420311 is an apocalyptic number.

1240420311 is a deficient number, since it is larger than the sum of its proper divisors (755091361).

1240420311 is a wasteful number, since it uses less digits than its factorization.

1240420311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178012 (or 1178003 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1240420311 is about 35219.6012328362. The cubic root of 1240420311 is about 1074.4584432143.

Adding to 1240420311 its reverse (1130240421), we get a palindrome (2370660732).

The spelling of 1240420311 in words is "one billion, two hundred forty million, four hundred twenty thousand, three hundred eleven".