1427861389 has 2 divisors, whose sum is σ = 1427861390. Its totient is φ = 1427861388.

The previous prime is 1427861387. The next prime is 1427861431. The reversal of 1427861389 is 9831687241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084055625 + 343805764 = 32925^2 + 18542^2 .

It is an emirp because it is prime and its reverse (9831687241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1427861389 - 2¹ = 1427861387 is a prime.

It is a super-3 number, since 3×1427861389³ (a number of 28 digits) contains 333 as substring.

Together with 1427861387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1427861387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713930694 + 713930695.

It is an arithmetic number, because the mean of its divisors is an integer number (713930695).

Almost surely, 2^1427861389 is an apocalyptic number.

It is an amenable number.

1427861389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427861389 is an equidigital number, since it uses as much as digits as its factorization.

1427861389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 1427861389 is about 37787.0531928596. The cubic root of 1427861389 is about 1126.0612573900.

The spelling of 1427861389 in words is "one billion, four hundred twenty-seven million, eight hundred sixty-one thousand, three hundred eighty-nine".