1393888649 has 2 divisors, whose sum is σ = 1393888650. Its totient is φ = 1393888648.

The previous prime is 1393888609. The next prime is 1393888663. The reversal of 1393888649 is 9468883931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1102572025 + 291316624 = 33205^2 + 17068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393888649 - 2²⁴ = 1377111433 is a prime.

It is a super-2 number, since 2×1393888649² = 3885851131622090402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1393888609) 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 as a sum of consecutive naturals, namely, 696944324 + 696944325.

It is an arithmetic number, because the mean of its divisors is an integer number (696944325).

Almost surely, 2^1393888649 is an apocalyptic number.

It is an amenable number.

1393888649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393888649 is an equidigital number, since it uses as much as digits as its factorization.

1393888649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8957952, while the sum is 59.

The square root of 1393888649 is about 37334.8181862454. The cubic root of 1393888649 is about 1117.0587818548.

The spelling of 1393888649 in words is "one billion, three hundred ninety-three million, eight hundred eighty-eight thousand, six hundred forty-nine".