1240006657 has 4 divisors (see below), whose sum is σ = 1240202160. Its totient is φ = 1239811156.

The previous prime is 1240006627. The next prime is 1240006759. The reversal of 1240006657 is 7566000421.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7566000421 = 7 ⋅1080857203.

It is a cyclic number.

It is not a de Polignac number, because 1240006657 - 2⁷ = 1240006529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240006627) 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, 87907 + ... + 101032.

It is an arithmetic number, because the mean of its divisors is an integer number (310050540).

It is a Proth number, since it is equal to 18921 ⋅ 2¹⁶ + 1 and 18921 < 2¹⁶.

Almost surely, 2^1240006657 is an apocalyptic number.

It is an amenable number.

1240006657 is a deficient number, since it is larger than the sum of its proper divisors (195503).

1240006657 is an equidigital number, since it uses as much as digits as its factorization.

1240006657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195502.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1240006657 is about 35213.7282462394. The cubic root of 1240006657 is about 1074.3389935290.

The spelling of 1240006657 in words is "one billion, two hundred forty million, six thousand, six hundred fifty-seven".