1387879 has 2 divisors, whose sum is σ = 1387880. Its totient is φ = 1387878.

The previous prime is 1387877. The next prime is 1387913. The reversal of 1387879 is 9787831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1387879 - 2¹ = 1387877 is a prime.

Together with 1387877, it forms a pair of twin primes.

It is an Ulam number.

1387879 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693939 + 693940.

It is an arithmetic number, because the mean of its divisors is an integer number (693940).

2^1387879 is an apocalyptic number.

1387879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387879 is an equidigital number, since it uses as much as digits as its factorization.

1387879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 43.

The square root of 1387879 is about 1178.0827644949. The cubic root of 1387879 is about 111.5451096742.

The spelling of 1387879 in words is "one million, three hundred eighty-seven thousand, eight hundred seventy-nine".