40999920 has 160 divisors (see below), whose sum is σ = 145115712. Its totient is φ = 9486336.

The previous prime is 40999843. The next prime is 40999921. The reversal of 40999920 is 2999904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40999921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52654 + ... + 53426.

Almost surely, 2^40999920 is an apocalyptic number.

40999920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40999920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72557856).

40999920 is an abundant number, since it is smaller than the sum of its proper divisors (104115792).

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

40999920 is a wasteful number, since it uses less digits than its factorization.

40999920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 40999920 is about 6403.1179904793. The cubic root of 40999920 is about 344.8214997638.

The spelling of 40999920 in words is "forty million, nine hundred ninety-nine thousand, nine hundred twenty".