1028731 has 8 divisors (see below), whose sum is σ = 1150128. Its totient is φ = 912000.

The previous prime is 1028683. The next prime is 1028737. The reversal of 1028731 is 1378201.

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-1028731 is a prime.

It is a super-2 number, since 2×1028731² = 2116574940722, which contains 22 as substring.

It is a Duffinian number.

1028731 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1028737) 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, 690 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (143766).

2^1028731 is an apocalyptic number.

1028731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1028731 is a deficient number, since it is larger than the sum of its proper divisors (121397).

1028731 is a wasteful number, since it uses less digits than its factorization.

1028731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1028731 is about 1014.2637723985. The cubic root of 1028731 is about 100.9486717595.

The spelling of 1028731 in words is "one million, twenty-eight thousand, seven hundred thirty-one".