40155217 has 4 divisors (see below), whose sum is σ = 41901120. Its totient is φ = 38409316.

The previous prime is 40155209. The next prime is 40155233. The reversal of 40155217 is 71255104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40155217 - 2³ = 40155209 is a prime.

It is a super-2 number, since 2×40155217² = 3224882904634178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40155191 and 40155200.

It is not an unprimeable number, because it can be changed into a prime (40155617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872917 + ... + 872962.

It is an arithmetic number, because the mean of its divisors is an integer number (10475280).

Almost surely, 2^40155217 is an apocalyptic number.

It is an amenable number.

40155217 is a deficient number, since it is larger than the sum of its proper divisors (1745903).

40155217 is a wasteful number, since it uses less digits than its factorization.

40155217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745902.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 40155217 is about 6336.8144205113. The cubic root of 40155217 is about 342.4369806087.

The spelling of 40155217 in words is "forty million, one hundred fifty-five thousand, two hundred seventeen".