166420838 has 4 divisors (see below), whose sum is σ = 249631260. Its totient is φ = 83210418.

The previous prime is 166420819. The next prime is 166420841. The reversal of 166420838 is 838024661.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41605208 + ... + 41605211.

It is an arithmetic number, because the mean of its divisors is an integer number (62407815).

Almost surely, 2^166420838 is an apocalyptic number.

166420838 is a deficient number, since it is larger than the sum of its proper divisors (83210422).

166420838 is an equidigital number, since it uses as much as digits as its factorization.

166420838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83210421.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 166420838 is about 12900.4200706799. The cubic root of 166420838 is about 550.0505055549.

The spelling of 166420838 in words is "one hundred sixty-six million, four hundred twenty thousand, eight hundred thirty-eight".