1377638244 has 72 divisors (see below), whose sum is σ = 3743725440. Its totient is φ = 425777472.

The previous prime is 1377638203. The next prime is 1377638267. The reversal of 1377638244 is 4428367731.

1377638244 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 638 + 2 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1377638244.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10722 + ... + 53574.

Almost surely, 2^1377638244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1377638244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1871862720).

1377638244 is an abundant number, since it is smaller than the sum of its proper divisors (2366087196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1377638244 is a wasteful number, since it uses less digits than its factorization.

1377638244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42929 (or 42924 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 1377638244 is about 37116.5494624702. The cubic root of 1377638244 is about 1112.7007911617.

The spelling of 1377638244 in words is "one billion, three hundred seventy-seven million, six hundred thirty-eight thousand, two hundred forty-four".