1390654 has 4 divisors (see below), whose sum is σ = 2085984. Its totient is φ = 695326.

The previous prime is 1390643. The next prime is 1390681. The reversal of 1390654 is 4560931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4560931 = 19 ⋅240049.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347662 + ... + 347665.

It is an arithmetic number, because the mean of its divisors is an integer number (521496).

2^1390654 is an apocalyptic number.

1390654 is a deficient number, since it is larger than the sum of its proper divisors (695330).

1390654 is an equidigital number, since it uses as much as digits as its factorization.

1390654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695329.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1390654 is about 1179.2599374184. The cubic root of 1390654 is about 111.6194032800.

The spelling of 1390654 in words is "one million, three hundred ninety thousand, six hundred fifty-four".