1240400489 has 16 divisors (see below), whose sum is σ = 1322365440. Its totient is φ = 1161578880.

The previous prime is 1240400407. The next prime is 1240400507. The reversal of 1240400489 is 9840040421.

It is a cyclic number.

It is not a de Polignac number, because 1240400489 - 2²⁰ = 1239351913 is a prime.

It is a super-2 number, since 2×1240400489² = 3077186746222878242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240400989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141029 + ... + 149565.

It is an arithmetic number, because the mean of its divisors is an integer number (82647840).

Almost surely, 2^1240400489 is an apocalyptic number.

It is an amenable number.

1240400489 is a deficient number, since it is larger than the sum of its proper divisors (81964951).

1240400489 is a wasteful number, since it uses less digits than its factorization.

1240400489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8720.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1240400489 is about 35219.3198259137. The cubic root of 1240400489 is about 1074.4527198778.

The spelling of 1240400489 in words is "one billion, two hundred forty million, four hundred thousand, four hundred eighty-nine".