842447157 has 16 divisors (see below), whose sum is σ = 1136520000. Its totient is φ = 555030144.

The previous prime is 842447153. The next prime is 842447171. The reversal of 842447157 is 751744248.

It is not a de Polignac number, because 842447157 - 2² = 842447153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842447153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130594 + ... + 136892.

It is an arithmetic number, because the mean of its divisors is an integer number (71032500).

Almost surely, 2^842447157 is an apocalyptic number.

It is an amenable number.

842447157 is a deficient number, since it is larger than the sum of its proper divisors (294072843).

842447157 is a wasteful number, since it uses less digits than its factorization.

842447157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6820.

The product of its digits is 250880, while the sum is 42.

The square root of 842447157 is about 29024.9402583365. The cubic root of 842447157 is about 944.4541726298.

The spelling of 842447157 in words is "eight hundred forty-two million, four hundred forty-seven thousand, one hundred fifty-seven".