162821916 has 18 divisors (see below), whose sum is σ = 411577712. Its totient is φ = 54273960.

The previous prime is 162821753. The next prime is 162821917. The reversal of 162821916 is 619128261.

162821916 is a `hidden beast` number, since 1 + 628 + 2 + 19 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×162821916² = 53021952659822112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4522831 = 162821916 / (1 + 6 + 2 + 8 + 2 + 1 + 9 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162821917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2261380 + ... + 2261451.

Almost surely, 2^162821916 is an apocalyptic number.

It is an amenable number.

162821916 is an abundant number, since it is smaller than the sum of its proper divisors (248755796).

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

162821916 is a wasteful number, since it uses less digits than its factorization.

162821916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522841 (or 4522836 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 162821916 is about 12760.1691211363. The cubic root of 162821916 is about 546.0565493094.

The spelling of 162821916 in words is "one hundred sixty-two million, eight hundred twenty-one thousand, nine hundred sixteen".