1377894399 has 16 divisors (see below), whose sum is σ = 2100214272. Its totient is φ = 787156128.

The previous prime is 1377894389. The next prime is 1377894407. The reversal of 1377894399 is 9934987731.

It is a happy number.

It is a Cunningham number, because it is equal to 37120²-1.

It is not a de Polignac number, because 1377894399 - 2¹³ = 1377886207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377894359) 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, 105177 + ... + 117549.

It is an arithmetic number, because the mean of its divisors is an integer number (131263392).

Almost surely, 2^1377894399 is an apocalyptic number.

1377894399 is a deficient number, since it is larger than the sum of its proper divisors (722319873).

1377894399 is a wasteful number, since it uses less digits than its factorization.

1377894399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17686.

The product of its digits is 10287648, while the sum is 60.

The square root of 1377894399 is about 37119.9999865302. Note that the first 4 decimals coincide. The cubic root of 1377894399 is about 1112.7697512603.

The spelling of 1377894399 in words is "one billion, three hundred seventy-seven million, eight hundred ninety-four thousand, three hundred ninety-nine".