1398027949 has 2 divisors, whose sum is σ = 1398027950. Its totient is φ = 1398027948.

The previous prime is 1398027947. The next prime is 1398027971. The reversal of 1398027949 is 9497208931.

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., 1278563049 + 119464900 = 35757^2 + 10930^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398027949 - 2¹ = 1398027947 is a prime.

Together with 1398027947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1398027896 and 1398027905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398027941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699013974 + 699013975.

It is an arithmetic number, because the mean of its divisors is an integer number (699013975).

Almost surely, 2^1398027949 is an apocalyptic number.

It is an amenable number.

1398027949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398027949 is an equidigital number, since it uses as much as digits as its factorization.

1398027949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 1398027949 is about 37390.2119410950. The cubic root of 1398027949 is about 1118.1634305797.

The spelling of 1398027949 in words is "one billion, three hundred ninety-eight million, twenty-seven thousand, nine hundred forty-nine".