1000320156 has 72 divisors (see below), whose sum is σ = 2766376704. Its totient is φ = 302257440.

The previous prime is 1000320131. The next prime is 1000320169. The reversal of 1000320156 is 6510230001.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141891 + ... + 148773.

Almost surely, 2^1000320156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000320156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383188352).

1000320156 is an abundant number, since it is smaller than the sum of its proper divisors (1766056548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000320156 is a wasteful number, since it uses less digits than its factorization.

1000320156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7271 (or 7266 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1000320156 is about 31627.8383074152. The cubic root of 1000320156 is about 1000.1067072798.

Adding to 1000320156 its reverse (6510230001), we get a palindrome (7510550157).

The spelling of 1000320156 in words is "one billion, three hundred twenty thousand, one hundred fifty-six".