156989447 has 4 divisors (see below), whose sum is σ = 160329696. Its totient is φ = 153649200.

The previous prime is 156989429. The next prime is 156989489. The reversal of 156989447 is 744989651.

156989447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 156989447 - 2¹⁰ = 156988423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156982447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670054 + ... + 1670147.

It is an arithmetic number, because the mean of its divisors is an integer number (40082424).

Almost surely, 2^156989447 is an apocalyptic number.

156989447 is a deficient number, since it is larger than the sum of its proper divisors (3340249).

156989447 is an equidigital number, since it uses as much as digits as its factorization.

156989447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340248.

The product of its digits is 2177280, while the sum is 53.

The square root of 156989447 is about 12529.5429685204. The cubic root of 156989447 is about 539.4569838550.

The spelling of 156989447 in words is "one hundred fifty-six million, nine hundred eighty-nine thousand, four hundred forty-seven".