1000156 has 12 divisors (see below), whose sum is σ = 1779400. Its totient is φ = 491760.

The previous prime is 1000151. The next prime is 1000159. The reversal of 1000156 is 6510001.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000151) 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 3 ways as a sum of consecutive naturals, for example, 1806 + ... + 2293.

2^1000156 is an apocalyptic number.

It is an amenable number.

1000156 is a deficient number, since it is larger than the sum of its proper divisors (779244).

1000156 is a wasteful number, since it uses less digits than its factorization.

1000156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4164 (or 4162 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1000156 is about 1000.0779969582. The cubic root of 1000156 is about 100.0051997296.

Adding to 1000156 its reverse (6510001), we get a palindrome (7510157).

It can be divided in two parts, 1000 and 156, that added together give a square (1156 = 34²).

The spelling of 1000156 in words is "one million, one hundred fifty-six", and thus it is an aban number.