1390555 has 4 divisors (see below), whose sum is σ = 1668672. Its totient is φ = 1112440.

The previous prime is 1390547. The next prime is 1390573. The reversal of 1390555 is 5550931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5550931 = 1259 ⋅4409.

It is not a de Polignac number, because 1390555 - 2³ = 1390547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139051 + ... + 139060.

It is an arithmetic number, because the mean of its divisors is an integer number (417168).

2^1390555 is an apocalyptic number.

1390555 is a deficient number, since it is larger than the sum of its proper divisors (278117).

1390555 is an equidigital number, since it uses as much as digits as its factorization.

1390555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278116.

The product of its (nonzero) digits is 3375, while the sum is 28.

The square root of 1390555 is about 1179.2179611929. The cubic root of 1390555 is about 111.6167545063.

The spelling of 1390555 in words is "one million, three hundred ninety thousand, five hundred fifty-five".