81419442 has 16 divisors (see below), whose sum is σ = 175365120. Its totient is φ = 25052112.

The previous prime is 81419419. The next prime is 81419447. The reversal of 81419442 is 24491418.

It is a super-4 number, since 4×81419442⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (81419447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521842 + ... + 521997.

It is an arithmetic number, because the mean of its divisors is an integer number (10960320).

Almost surely, 2^81419442 is an apocalyptic number.

81419442 is an abundant number, since it is smaller than the sum of its proper divisors (93945678).

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

81419442 is a wasteful number, since it uses less digits than its factorization.

81419442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043857.

The product of its digits is 9216, while the sum is 33.

The square root of 81419442 is about 9023.2722445907. The cubic root of 81419442 is about 433.4204252300.

The spelling of 81419442 in words is "eighty-one million, four hundred nineteen thousand, four hundred forty-two".