40156643 has 8 divisors (see below), whose sum is σ = 42478368. Its totient is φ = 37882944.

The previous prime is 40156637. The next prime is 40156661. The reversal of 40156643 is 34665104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40156643 - 2¹² = 40152547 is a prime.

It is a super-2 number, since 2×40156643² = 3225111954058898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40156603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10280 + ... + 13637.

It is an arithmetic number, because the mean of its divisors is an integer number (5309796).

Almost surely, 2^40156643 is an apocalyptic number.

40156643 is a deficient number, since it is larger than the sum of its proper divisors (2321725).

40156643 is a wasteful number, since it uses less digits than its factorization.

40156643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24013.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 40156643 is about 6336.9269366153. The cubic root of 40156643 is about 342.4410341240.

The spelling of 40156643 in words is "forty million, one hundred fifty-six thousand, six hundred forty-three".