164821942 has 4 divisors (see below), whose sum is σ = 247232916. Its totient is φ = 82410970.

The previous prime is 164821907. The next prime is 164822011. The reversal of 164821942 is 249128461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249128461 = 53 ⋅4700537.

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, 41205484 + ... + 41205487.

It is an arithmetic number, because the mean of its divisors is an integer number (61808229).

Almost surely, 2^164821942 is an apocalyptic number.

164821942 is a deficient number, since it is larger than the sum of its proper divisors (82410974).

164821942 is an equidigital number, since it uses as much as digits as its factorization.

164821942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82410973.

The product of its digits is 27648, while the sum is 37.

The square root of 164821942 is about 12838.2998095542. The cubic root of 164821942 is about 548.2832885369.

The spelling of 164821942 in words is "one hundred sixty-four million, eight hundred twenty-one thousand, nine hundred forty-two".