40071808 has 48 divisors (see below), whose sum is σ = 92878650. Its totient is φ = 17170944.

The previous prime is 40071799. The next prime is 40071847. The reversal of 40071808 is 80817004.

It can be written as a sum of positive squares in only one way, i.e., 40043584 + 28224 = 6328^2 + 168^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3078 + ... + 9466.

Almost surely, 2^40071808 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 40071808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46439325).

40071808 is an abundant number, since it is smaller than the sum of its proper divisors (52806842).

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

40071808 is an equidigital number, since it uses as much as digits as its factorization.

40071808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6417 (or 6398 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 40071808 is about 6330.2296956746. The cubic root of 40071808 is about 342.1997169161.

The spelling of 40071808 in words is "forty million, seventy-one thousand, eight hundred eight".