156897842 has 4 divisors (see below), whose sum is σ = 235346766. Its totient is φ = 78448920.

The previous prime is 156897821. The next prime is 156897847. The reversal of 156897842 is 248798651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248798651 = 829 ⋅300119.

It can be written as a sum of positive squares in only one way, i.e., 107350321 + 49547521 = 10361^2 + 7039^2 .

It is not an unprimeable number, because it can be changed into a prime (156897847) 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 as a sum of consecutive naturals, namely, 39224459 + ... + 39224462.

Almost surely, 2^156897842 is an apocalyptic number.

156897842 is a deficient number, since it is larger than the sum of its proper divisors (78448924).

156897842 is an equidigital number, since it uses as much as digits as its factorization.

156897842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78448923.

The product of its digits is 967680, while the sum is 50.

The square root of 156897842 is about 12525.8868747885. The cubic root of 156897842 is about 539.3520371577.

The spelling of 156897842 in words is "one hundred fifty-six million, eight hundred ninety-seven thousand, eight hundred forty-two".