40001020 has 24 divisors (see below), whose sum is σ = 85017744. Its totient is φ = 15806976.

The previous prime is 40000993. The next prime is 40001021. The reversal of 40001020 is 2010004.

It is a junction number, because it is equal to n+sod(n) for n = 40000994 and 40001012.

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 7 ways as a sum of consecutive naturals, for example, 10389 + ... + 13708.

It is an arithmetic number, because the mean of its divisors is an integer number (3542406).

Almost surely, 2^40001020 is an apocalyptic number.

It is an amenable number.

40001020 is an abundant number, since it is smaller than the sum of its proper divisors (45016724).

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

40001020 is a wasteful number, since it uses less digits than its factorization.

40001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24189 (or 24187 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 40001020 is about 6324.6359579030. The cubic root of 40001020 is about 341.9980962697.

Adding to 40001020 its reverse (2010004), we get a palindrome (42011024).

The spelling of 40001020 in words is "forty million, one thousand, twenty".