1390655 has 8 divisors (see below), whose sum is σ = 1907232. Its totient is φ = 953568.

The previous prime is 1390643. The next prime is 1390681. The reversal of 1390655 is 5560931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1390655 - 2⁴ = 1390639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19832 + ... + 19901.

It is an arithmetic number, because the mean of its divisors is an integer number (238404).

2^1390655 is an apocalyptic number.

1390655 is a deficient number, since it is larger than the sum of its proper divisors (516577).

1390655 is an equidigital number, since it uses as much as digits as its factorization.

1390655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39745.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 1390655 is about 1179.2603614130. The cubic root of 1390655 is about 111.6194300346.

The spelling of 1390655 in words is "one million, three hundred ninety thousand, six hundred fifty-five".