40001025 has 24 divisors (see below), whose sum is σ = 69013440. Its totient is φ = 20405440.

The previous prime is 40001021. The next prime is 40001041. The reversal of 40001025 is 52010004.

It is not a de Polignac number, because 40001025 - 2² = 40001021 is a prime.

40001025 is a modest number, since divided by 1025 gives 400 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 40001025.

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 23 ways as a sum of consecutive naturals, for example, 9870 + ... + 13319.

It is an arithmetic number, because the mean of its divisors is an integer number (2875560).

Almost surely, 2^40001025 is an apocalyptic number.

It is an amenable number.

40001025 is a deficient number, since it is larger than the sum of its proper divisors (29012415).

40001025 is a wasteful number, since it uses less digits than its factorization.

40001025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23225 (or 23220 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40001025 is about 6324.6363531827. The cubic root of 40001025 is about 341.9981105193.

Adding to 40001025 its reverse (52010004), we get a palindrome (92011029).

The spelling of 40001025 in words is "forty million, one thousand, twenty-five".