81433946 has 8 divisors (see below), whose sum is σ = 133255584. Its totient is φ = 37015420.

The previous prime is 81433921. The next prime is 81433949. The reversal of 81433946 is 64933418.

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

It is a super-2 number, since 2×81433946² = 13262975122261832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81433949) 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, 1850750 + ... + 1850793.

It is an arithmetic number, because the mean of its divisors is an integer number (16656948).

Almost surely, 2^81433946 is an apocalyptic number.

81433946 is a deficient number, since it is larger than the sum of its proper divisors (51821638).

81433946 is a wasteful number, since it uses less digits than its factorization.

81433946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701556.

The product of its digits is 62208, while the sum is 38.

The square root of 81433946 is about 9024.0759083687. The cubic root of 81433946 is about 433.4461601014.

The spelling of 81433946 in words is "eighty-one million, four hundred thirty-three thousand, nine hundred forty-six".