1390649 has 8 divisors (see below), whose sum is σ = 1563072. Its totient is φ = 1227600.

The previous prime is 1390643. The next prime is 1390681. The reversal of 1390649 is 9460931.

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

It is a cyclic number.

It is not a de Polignac number, because 1390649 - 2⁴ = 1390633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2027 + ... + 2624.

It is an arithmetic number, because the mean of its divisors is an integer number (195384).

2^1390649 is an apocalyptic number.

It is an amenable number.

1390649 is a deficient number, since it is larger than the sum of its proper divisors (172423).

1390649 is a wasteful number, since it uses less digits than its factorization.

1390649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1390649 is about 1179.2578174428. The cubic root of 1390649 is about 111.6192695066.

The spelling of 1390649 in words is "one million, three hundred ninety thousand, six hundred forty-nine".