1390918 has 8 divisors (see below), whose sum is σ = 2130912. Its totient is φ = 680616.

The previous prime is 1390913. The next prime is 1390919. The reversal of 1390918 is 8190931.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1390918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390913) 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, 7305 + ... + 7492.

It is an arithmetic number, because the mean of its divisors is an integer number (266364).

2^1390918 is an apocalyptic number.

1390918 is a deficient number, since it is larger than the sum of its proper divisors (739994).

1390918 is a wasteful number, since it uses less digits than its factorization.

1390918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14846.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1390918 is about 1179.3718667155. The cubic root of 1390918 is about 111.6264660620.

The spelling of 1390918 in words is "one million, three hundred ninety thousand, nine hundred eighteen".