1384239257 has 2 divisors, whose sum is σ = 1384239258. Its totient is φ = 1384239256.

The previous prime is 1384239251. The next prime is 1384239289. The reversal of 1384239257 is 7529324831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1370184256 + 14055001 = 37016^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1384239257 - 2⁶ = 1384239193 is a prime.

It is a super-2 number, since 2×1384239257² = 3832236641239824098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1384239251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692119628 + 692119629.

It is an arithmetic number, because the mean of its divisors is an integer number (692119629).

Almost surely, 2^1384239257 is an apocalyptic number.

It is an amenable number.

1384239257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1384239257 is an equidigital number, since it uses as much as digits as its factorization.

1384239257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 1384239257 is about 37205.3659705156. The cubic root of 1384239257 is about 1114.4751448015.

The spelling of 1384239257 in words is "one billion, three hundred eighty-four million, two hundred thirty-nine thousand, two hundred fifty-seven".