84401657 has 4 divisors (see below), whose sum is σ = 86460276. Its totient is φ = 82343040.

The previous prime is 84401641. The next prime is 84401663. The reversal of 84401657 is 75610448.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45414121 + 38987536 = 6739^2 + 6244^2 .

It is a cyclic number.

It is not a de Polignac number, because 84401657 - 2⁴ = 84401641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84401677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1029248 + ... + 1029329.

It is an arithmetic number, because the mean of its divisors is an integer number (21615069).

Almost surely, 2^84401657 is an apocalyptic number.

It is an amenable number.

84401657 is a deficient number, since it is larger than the sum of its proper divisors (2058619).

84401657 is a wasteful number, since it uses less digits than its factorization.

84401657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058618.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 84401657 is about 9187.0374441383. The cubic root of 84401657 is about 438.6488458186.

It can be divided in two parts, 84401 and 657, that added together give a palindrome (85058).

The spelling of 84401657 in words is "eighty-four million, four hundred one thousand, six hundred fifty-seven".