40172042820 has 384 divisors, whose sum is σ = 141436108800. Its totient is φ = 8294307840.

The previous prime is 40172042783. The next prime is 40172042863. The reversal of 40172042820 is 2824027104.

It is a super-2 number, since 2×40172042820² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 67064881 + ... + 67065479.

It is an arithmetic number, because the mean of its divisors is an integer number (368323200).

Almost surely, 2^40172042820 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 40172042820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70718054400).

40172042820 is an abundant number, since it is smaller than the sum of its proper divisors (101264065980).

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

40172042820 is a wasteful number, since it uses less digits than its factorization.

40172042820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

Adding to 40172042820 its reverse (2824027104), we get a palindrome (42996069924).

The spelling of 40172042820 in words is "forty billion, one hundred seventy-two million, forty-two thousand, eight hundred twenty".