1390691 has 8 divisors (see below), whose sum is σ = 1451904. Its totient is φ = 1330560.

The previous prime is 1390681. The next prime is 1390693. The reversal of 1390691 is 1960931.

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 1390691 - 2¹⁰ = 1389667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390693) 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, 3305 + ... + 3701.

It is an arithmetic number, because the mean of its divisors is an integer number (181488).

2^1390691 is an apocalyptic number.

1390691 is a deficient number, since it is larger than the sum of its proper divisors (61213).

1390691 is a wasteful number, since it uses less digits than its factorization.

1390691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1390691 is about 1179.2756251191. The cubic root of 1390691 is about 111.6203931934.

The spelling of 1390691 in words is "one million, three hundred ninety thousand, six hundred ninety-one".