1377852861 has 16 divisors (see below), whose sum is σ = 2290457088. Its totient is φ = 715767600.

The previous prime is 1377852859. The next prime is 1377852899. The reversal of 1377852861 is 1682587731.

It is a happy number.

It is not a de Polignac number, because 1377852861 - 2¹ = 1377852859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377852861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377852821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2982135 + ... + 2982596.

It is an arithmetic number, because the mean of its divisors is an integer number (143153568).

Almost surely, 2^1377852861 is an apocalyptic number.

1377852861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1377852861 is a deficient number, since it is larger than the sum of its proper divisors (912604227).

1377852861 is a wasteful number, since it uses less digits than its factorization.

1377852861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5964752.

The product of its digits is 564480, while the sum is 48.

The square root of 1377852861 is about 37119.4404726149. The cubic root of 1377852861 is about 1112.7585692968.

The spelling of 1377852861 in words is "one billion, three hundred seventy-seven million, eight hundred fifty-two thousand, eight hundred sixty-one".