168621442 has 8 divisors (see below), whose sum is σ = 275926032. Its totient is φ = 76646100.

The previous prime is 168621437. The next prime is 168621449. The reversal of 168621442 is 244126861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×168621442³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 168621398 and 168621407.

It is not an unprimeable number, because it can be changed into a prime (168621449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3832284 + ... + 3832327.

It is an arithmetic number, because the mean of its divisors is an integer number (34490754).

Almost surely, 2^168621442 is an apocalyptic number.

168621442 is a deficient number, since it is larger than the sum of its proper divisors (107304590).

168621442 is a wasteful number, since it uses less digits than its factorization.

168621442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7664624.

The product of its digits is 18432, while the sum is 34.

The square root of 168621442 is about 12985.4319142645. The cubic root of 168621442 is about 552.4643597465.

The spelling of 168621442 in words is "one hundred sixty-eight million, six hundred twenty-one thousand, four hundred forty-two".