40072805 has 18 divisors (see below), whose sum is σ = 51094386. Its totient is φ = 30167136.

The previous prime is 40072793. The next prime is 40072817. The reversal of 40072805 is 50827004.

It is an interprime number because it is at equal distance from previous prime (40072793) and next prime (40072817).

It can be written as a sum of positive squares in 3 ways, for example, as 521284 + 39551521 = 722^2 + 6289^2 .

It is not a de Polignac number, because 40072805 - 2⁴ = 40072789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 268871 + ... + 269019.

It is an arithmetic number, because the mean of its divisors is an integer number (2838577).

Almost surely, 2^40072805 is an apocalyptic number.

It is an amenable number.

40072805 is a deficient number, since it is larger than the sum of its proper divisors (11021581).

40072805 is an equidigital number, since it uses as much as digits as its factorization.

40072805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 40072805 is about 6330.3084443019. The cubic root of 40072805 is about 342.2025549071.

Adding to 40072805 its reverse (50827004), we get a palindrome (90899809).

The spelling of 40072805 in words is "forty million, seventy-two thousand, eight hundred five".