40023720 has 160 divisors (see below), whose sum is σ = 146884320. Its totient is φ = 9694080.

The previous prime is 40023701. The next prime is 40023733. The reversal of 40023720 is 2732004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 40023693 and 40023702.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35079 + ... + 36201.

It is an arithmetic number, because the mean of its divisors is an integer number (918027).

Almost surely, 2^40023720 is an apocalyptic number.

40023720 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 40023720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73442160).

40023720 is an abundant number, since it is smaller than the sum of its proper divisors (106860600).

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

40023720 is a wasteful number, since it uses less digits than its factorization.

40023720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 40023720 is about 6326.4302730687. The cubic root of 40023720 is about 342.0627770264.

Adding to 40023720 its reverse (2732004), we get a palindrome (42755724).

The spelling of 40023720 in words is "forty million, twenty-three thousand, seven hundred twenty".