1381087 has 4 divisors (see below), whose sum is σ = 1400080. Its totient is φ = 1362096.

The previous prime is 1381069. The next prime is 1381103. The reversal of 1381087 is 7801831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7801831 = 941 ⋅8291.

It is a cyclic number.

It is not a de Polignac number, because 1381087 - 2⁷ = 1380959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9387 + ... + 9532.

It is an arithmetic number, because the mean of its divisors is an integer number (350020).

2^1381087 is an apocalyptic number.

1381087 is the 679-th hex number.

1381087 is a deficient number, since it is larger than the sum of its proper divisors (18993).

1381087 is an equidigital number, since it uses as much as digits as its factorization.

1381087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18992.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1381087 is about 1175.1965793007. The cubic root of 1381087 is about 111.3628522808.

It can be divided in two parts, 138 and 1087, that added together give a triangular number (1225 = T₄₉).

The spelling of 1381087 in words is "one million, three hundred eighty-one thousand, eighty-seven".