1290731 has 8 divisors (see below), whose sum is σ = 1422960. Its totient is φ = 1163232.

The previous prime is 1290719. The next prime is 1290791. The reversal of 1290731 is 1370921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1290731 is a prime.

It is a super-2 number, since 2×1290731² = 3331973028722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1290697 and 1290706.

It is not an unprimeable number, because it can be changed into a prime (1290791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (177870).

2^1290731 is an apocalyptic number.

1290731 is a deficient number, since it is larger than the sum of its proper divisors (132229).

1290731 is a wasteful number, since it uses less digits than its factorization.

1290731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 1290731 is about 1136.1034283902. The cubic root of 1290731 is about 108.8792816658.

The spelling of 1290731 in words is "one million, two hundred ninety thousand, seven hundred thirty-one".