157821006 has 16 divisors (see below), whose sum is σ = 360733824. Its totient is φ = 45091704.

The previous prime is 157820989. The next prime is 157821007. The reversal of 157821006 is 600128751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821007) 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 in 7 ways as a sum of consecutive naturals, for example, 1878780 + ... + 1878863.

It is an arithmetic number, because the mean of its divisors is an integer number (22545864).

Almost surely, 2^157821006 is an apocalyptic number.

157821006 is an abundant number, since it is smaller than the sum of its proper divisors (202912818).

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

157821006 is a wasteful number, since it uses less digits than its factorization.

157821006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757655.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 157821006 is about 12562.6830732929. The cubic root of 157821006 is about 540.4077921071.

Adding to 157821006 its reverse (600128751), we get a palindrome (757949757).

The spelling of 157821006 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, six".