1138440257 has 8 divisors (see below), whose sum is σ = 1143090312. Its totient is φ = 1133798400.

The previous prime is 1138440253. The next prime is 1138440301. The reversal of 1138440257 is 7520448311.

It can be written as a sum of positive squares in 4 ways, for example, as 91853056 + 1046587201 = 9584^2 + 32351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1138440257 - 2² = 1138440253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138440253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497957 + ... + 500237.

It is an arithmetic number, because the mean of its divisors is an integer number (142886289).

Almost surely, 2^1138440257 is an apocalyptic number.

It is an amenable number.

1138440257 is a deficient number, since it is larger than the sum of its proper divisors (4650055).

1138440257 is a wasteful number, since it uses less digits than its factorization.

1138440257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 1138440257 is about 33740.7803258905. The cubic root of 1138440257 is about 1044.1672836295.

Adding to 1138440257 its reverse (7520448311), we get a palindrome (8658888568).

The spelling of 1138440257 in words is "one billion, one hundred thirty-eight million, four hundred forty thousand, two hundred fifty-seven".