40039967 has 4 divisors (see below), whose sum is σ = 43679976. Its totient is φ = 36399960.

The previous prime is 40039949. The next prime is 40039991. The reversal of 40039967 is 76993004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40039967 - 2¹² = 40035871 is a prime.

It is a super-2 number, since 2×40039967² = 3206397914722178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40039967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40039907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819988 + ... + 1820009.

It is an arithmetic number, because the mean of its divisors is an integer number (10919994).

Almost surely, 2^40039967 is an apocalyptic number.

40039967 is a deficient number, since it is larger than the sum of its proper divisors (3640009).

40039967 is a wasteful number, since it uses less digits than its factorization.

40039967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640008.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 40039967 is about 6327.7142002464. The cubic root of 40039967 is about 342.1090557674.

The spelling of 40039967 in words is "forty million, thirty-nine thousand, nine hundred sixty-seven".