1377638749 has 8 divisors (see below), whose sum is σ = 1385517888. Its totient is φ = 1369781280.

The previous prime is 1377638737. The next prime is 1377638767. The reversal of 1377638749 is 9478367731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1377638749 - 2⁷ = 1377638621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1377638749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377632749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131814 + ... + 141880.

It is an arithmetic number, because the mean of its divisors is an integer number (173189736).

Almost surely, 2^1377638749 is an apocalyptic number.

It is an amenable number.

1377638749 is a deficient number, since it is larger than the sum of its proper divisors (7879139).

1377638749 is a wasteful number, since it uses less digits than its factorization.

1377638749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10835.

The product of its digits is 5334336, while the sum is 55.

The square root of 1377638749 is about 37116.5562653649. The cubic root of 1377638749 is about 1112.7009271223.

It can be divided in two parts, 13776 and 38749, that added together give a palindrome (52525).

The spelling of 1377638749 in words is "one billion, three hundred seventy-seven million, six hundred thirty-eight thousand, seven hundred forty-nine".