83111440 has 40 divisors (see below), whose sum is σ = 193969728. Its totient is φ = 33118080.

The previous prime is 83111437. The next prime is 83111459. The reversal of 83111440 is 4411138.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×83111440² = 13815022917747200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20805 + ... + 24475.

Almost surely, 2^83111440 is an apocalyptic number.

83111440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83111440 is an abundant number, since it is smaller than the sum of its proper divisors (110858288).

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

83111440 is a wasteful number, since it uses less digits than its factorization.

83111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967 (or 3961 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 83111440 is about 9116.5475921535. The cubic root of 83111440 is about 436.4022043983.

Adding to 83111440 its reverse (4411138), we get a palindrome (87522578).

The spelling of 83111440 in words is "eighty-three million, one hundred eleven thousand, four hundred forty".