1379987 has 6 divisors (see below), whose sum is σ = 1605348. Its totient is φ = 1182804.

The previous prime is 1379981. The next prime is 1379993. The reversal of 1379987 is 7899731.

It is an interprime number because it is at equal distance from previous prime (1379981) and next prime (1379993).

It is not a de Polignac number, because 1379987 - 2⁶ = 1379923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14033 + ... + 14130.

It is an arithmetic number, because the mean of its divisors is an integer number (267558).

2^1379987 is an apocalyptic number.

1379987 is a deficient number, since it is larger than the sum of its proper divisors (225361).

1379987 is an equidigital number, since it uses as much as digits as its factorization.

1379987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28177 (or 28170 counting only the distinct ones).

The product of its digits is 95256, while the sum is 44.

The square root of 1379987 is about 1174.7284792666. The cubic root of 1379987 is about 111.3332785526. Note that the first 3 decimals are identical.

The spelling of 1379987 in words is "one million, three hundred seventy-nine thousand, nine hundred eighty-seven".