40039965 has 48 divisors (see below), whose sum is σ = 80371200. Its totient is φ = 18061056.

The previous prime is 40039949. The next prime is 40039991. The reversal of 40039965 is 56993004.

It is not a de Polignac number, because 40039965 - 2⁴ = 40039949 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24081 + ... + 25689.

It is an arithmetic number, because the mean of its divisors is an integer number (1674400).

Almost surely, 2^40039965 is an apocalyptic number.

40039965 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40039965 is an abundant number, since it is smaller than the sum of its proper divisors (40331235).

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

40039965 is a wasteful number, since it uses less digits than its factorization.

40039965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1703 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 40039965 is about 6327.7140422115. The cubic root of 40039965 is about 342.1090500712.

It can be divided in two parts, 4003996 and 5, that added together give a square (4004001 = 2001²).

The spelling of 40039965 in words is "forty million, thirty-nine thousand, nine hundred sixty-five".