1390281 has 8 divisors (see below), whose sum is σ = 1934400. Its totient is φ = 886512.

The previous prime is 1390253. The next prime is 1390283. The reversal of 1390281 is 1820931.

1390281 = T₃₈₄ + T₃₈₅ + ... + T₄₀₁.

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

It is not a de Polignac number, because 1390281 - 2⁹ = 1389769 is a prime.

It is a super-2 number, since 2×1390281² = 3865762517922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1390283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10006 + ... + 10143.

It is an arithmetic number, because the mean of its divisors is an integer number (241800).

2^1390281 is an apocalyptic number.

It is an amenable number.

1390281 is a deficient number, since it is larger than the sum of its proper divisors (544119).

1390281 is a wasteful number, since it uses less digits than its factorization.

1390281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20175.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1390281 is about 1179.1017767776. The cubic root of 1390281 is about 111.6094229014.

The spelling of 1390281 in words is "one million, three hundred ninety thousand, two hundred eighty-one".