40073220 has 144 divisors (see below), whose sum is σ = 136438848. Its totient is φ = 9434880.

The previous prime is 40073207. The next prime is 40073221. The reversal of 40073220 is 2237004.

It is a happy number.

It is a super-2 number, since 2×40073220² = 3211725922336800, which contains 22 as substring.

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 = 40073193 and 40073202.

It is not an unprimeable number, because it can be changed into a prime (40073221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72987 + ... + 73533.

It is an arithmetic number, because the mean of its divisors is an integer number (947492).

Almost surely, 2^40073220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40073220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68219424).

40073220 is an abundant number, since it is smaller than the sum of its proper divisors (96365628).

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

40073220 is a wasteful number, since it uses less digits than its factorization.

40073220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610 (or 605 counting only the distinct ones).

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

The square root of 40073220 is about 6330.3412230306. The cubic root of 40073220 is about 342.2037362034.

It can be divided in two parts, 4007 and 3220, that added together give a palindrome (7227).

The spelling of 40073220 in words is "forty million, seventy-three thousand, two hundred twenty".