8156742 has 32 divisors (see below), whose sum is σ = 18023040. Its totient is φ = 2440320.

The previous prime is 8156723. The next prime is 8156749. The reversal of 8156742 is 2476518.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8156749) 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 15 ways as a sum of consecutive naturals, for example, 4734 + ... + 6222.

It is an arithmetic number, because the mean of its divisors is an integer number (563220).

Almost surely, 2^8156742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8156742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9011520).

8156742 is an abundant number, since it is smaller than the sum of its proper divisors (9866298).

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

8156742 is a wasteful number, since it uses less digits than its factorization.

8156742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

The product of its digits is 13440, while the sum is 33.

The square root of 8156742 is about 2856.0010504200. The cubic root of 8156742 is about 201.2977444173.

It can be divided in two parts, 815 and 6742, that added together give a palindrome (7557).

The spelling of 8156742 in words is "eight million, one hundred fifty-six thousand, seven hundred forty-two".