40155643 has 8 divisors (see below), whose sum is σ = 44299440. Its totient is φ = 36094080.

The previous prime is 40155623. The next prime is 40155653. The reversal of 40155643 is 34655104.

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

It is not a de Polignac number, because 40155643 - 2⁹ = 40155131 is a prime.

It is a super-2 number, since 2×40155643² = 3224951329486898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40155623) 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, 19530 + ... + 21487.

It is an arithmetic number, because the mean of its divisors is an integer number (5537430).

Almost surely, 2^40155643 is an apocalyptic number.

40155643 is a deficient number, since it is larger than the sum of its proper divisors (4143797).

40155643 is a wasteful number, since it uses less digits than its factorization.

40155643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41117.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 40155643 is about 6336.8480335258. The cubic root of 40155643 is about 342.4381915567.

The spelling of 40155643 in words is "forty million, one hundred fifty-five thousand, six hundred forty-three".