1438722657 has 12 divisors (see below), whose sum is σ = 2168509824. Its totient is φ = 917446200.

The previous prime is 1438722613. The next prime is 1438722661. The reversal of 1438722657 is 7562278341.

1438722657 is a `hidden beast` number, since 1 + 4 + 387 + 2 + 265 + 7 = 666.

It is not a de Polignac number, because 1438722657 - 2¹⁰ = 1438721633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1438722157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3474969 + ... + 3475382.

It is an arithmetic number, because the mean of its divisors is an integer number (180709152).

Almost surely, 2^1438722657 is an apocalyptic number.

It is an amenable number.

1438722657 is a deficient number, since it is larger than the sum of its proper divisors (729787167).

1438722657 is a wasteful number, since it uses less digits than its factorization.

1438722657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6950380 (or 6950377 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 1438722657 is about 37930.4977162178. The cubic root of 1438722657 is about 1128.9092398306.

The spelling of 1438722657 in words is "one billion, four hundred thirty-eight million, seven hundred twenty-two thousand, six hundred fifty-seven".