40001022 has 24 divisors (see below), whose sum is σ = 87016176. Its totient is φ = 13280256.

The previous prime is 40001021. The next prime is 40001041. The reversal of 40001022 is 22010004.

It is a super-2 number, since 2×40001022² = 3200163522088968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 40000995 and 40001013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40001021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303 + ... + 8949.

It is an arithmetic number, because the mean of its divisors is an integer number (3625674).

Almost surely, 2^40001022 is an apocalyptic number.

40001022 is an abundant number, since it is smaller than the sum of its proper divisors (47015154).

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

40001022 is a wasteful number, since it uses less digits than its factorization.

40001022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8912 (or 8909 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 40001022 is about 6324.6361160149. The cubic root of 40001022 is about 341.9981019696.

Adding to 40001022 its reverse (22010004), we get a palindrome (62011026).

The spelling of 40001022 in words is "forty million, one thousand, twenty-two".