1377629989 has 2 divisors, whose sum is σ = 1377629990. Its totient is φ = 1377629988.

The previous prime is 1377629977. The next prime is 1377630041. The reversal of 1377629989 is 9899267731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 738045889 + 639584100 = 27167^2 + 25290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377629989 - 2¹³ = 1377621797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377629909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688814994 + 688814995.

It is an arithmetic number, because the mean of its divisors is an integer number (688814995).

Almost surely, 2^1377629989 is an apocalyptic number.

It is an amenable number.

1377629989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377629989 is an equidigital number, since it uses as much as digits as its factorization.

1377629989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 61.

The square root of 1377629989 is about 37116.4382585398. The cubic root of 1377629989 is about 1112.6985686713.

The spelling of 1377629989 in words is "one billion, three hundred seventy-seven million, six hundred twenty-nine thousand, nine hundred eighty-nine".