800000156 has 6 divisors (see below), whose sum is σ = 1400000280. Its totient is φ = 400000076.

The previous prime is 800000153. The next prime is 800000171. The reversal of 800000156 is 651000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800000153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100000016 + ... + 100000023.

It is an arithmetic number, because the mean of its divisors is an integer number (233333380).

Almost surely, 2^800000156 is an apocalyptic number.

It is an amenable number.

800000156 is a deficient number, since it is larger than the sum of its proper divisors (600000124).

800000156 is a wasteful number, since it uses less digits than its factorization.

800000156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200000043 (or 200000041 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 800000156 is about 28284.2740051782. The cubic root of 800000156 is about 928.3178270632.

The spelling of 800000156 in words is "eight hundred million, one hundred fifty-six", and thus it is an aban number.