1390945 has 8 divisors (see below), whose sum is σ = 1676736. Its totient is φ = 1107696.

The previous prime is 1390937. The next prime is 1390967. The reversal of 1390945 is 5490931.

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 1390945 - 2³ = 1390937 is a prime.

It is a Duffinian 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, 924 + ... + 1906.

It is an arithmetic number, because the mean of its divisors is an integer number (209592).

2^1390945 is an apocalyptic number.

It is an amenable number.

1390945 is a deficient number, since it is larger than the sum of its proper divisors (285791).

1390945 is an equidigital number, since it uses as much as digits as its factorization.

1390945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1390945 is about 1179.3833134312. The cubic root of 1390945 is about 111.6271883416.

The spelling of 1390945 in words is "one million, three hundred ninety thousand, nine hundred forty-five".