40409855 has 4 divisors (see below), whose sum is σ = 48491832. Its totient is φ = 32327880.

The previous prime is 40409851. The next prime is 40409869. The reversal of 40409855 is 55890404.

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

It is not a de Polignac number, because 40409855 - 2² = 40409851 is a prime.

It is a super-2 number, since 2×40409855² = 3265912762242050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40409851) 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, 4040981 + ... + 4040990.

It is an arithmetic number, because the mean of its divisors is an integer number (12122958).

Almost surely, 2^40409855 is an apocalyptic number.

40409855 is a deficient number, since it is larger than the sum of its proper divisors (8081977).

40409855 is an equidigital number, since it uses as much as digits as its factorization.

40409855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8081976.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 40409855 is about 6356.8746251598. The cubic root of 40409855 is about 343.1592927152.

The spelling of 40409855 in words is "forty million, four hundred nine thousand, eight hundred fifty-five".