1390426 has 8 divisors (see below), whose sum is σ = 2096820. Its totient is φ = 691488.

The previous prime is 1390421. The next prime is 1390457. The reversal of 1390426 is 6240931.

It can be written as a sum of positive squares in 2 ways, for example, as 1380625 + 9801 = 1175^2 + 99^2 .

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

It is a super-2 number, since 2×1390426² = 3866568922952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1390426.

It is not an unprimeable number, because it can be changed into a prime (1390421) 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, 1371 + ... + 2158.

2^1390426 is an apocalyptic number.

1390426 is a deficient number, since it is larger than the sum of its proper divisors (706394).

1390426 is a wasteful number, since it uses less digits than its factorization.

1390426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1390426 is about 1179.1632626570. The cubic root of 1390426 is about 111.6133028853.

The spelling of 1390426 in words is "one million, three hundred ninety thousand, four hundred twenty-six".