1389227977 has 4 divisors (see below), whose sum is σ = 1437132420. Its totient is φ = 1341323536.

The previous prime is 1389227963. The next prime is 1389228007. The reversal of 1389227977 is 7797229831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1078728336 + 310499641 = 32844^2 + 17621^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389227977 - 2⁷ = 1389227849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389267977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23952178 + ... + 23952235.

It is an arithmetic number, because the mean of its divisors is an integer number (359283105).

Almost surely, 2^1389227977 is an apocalyptic number.

It is an amenable number.

1389227977 is a deficient number, since it is larger than the sum of its proper divisors (47904443).

1389227977 is an equidigital number, since it uses as much as digits as its factorization.

1389227977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47904442.

The product of its digits is 2667168, while the sum is 55.

The square root of 1389227977 is about 37272.3486917581. The cubic root of 1389227977 is about 1115.8123747838.

The spelling of 1389227977 in words is "one billion, three hundred eighty-nine million, two hundred twenty-seven thousand, nine hundred seventy-seven".