40170155 has 4 divisors (see below), whose sum is σ = 48204192. Its totient is φ = 32136120.

The previous prime is 40170149. The next prime is 40170211. The reversal of 40170155 is 55107104.

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

It is not a de Polignac number, because 40170155 - 2¹⁰ = 40169131 is a prime.

It is a super-2 number, since 2×40170155² = 3227282705448050, 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 40170155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4017011 + ... + 4017020.

It is an arithmetic number, because the mean of its divisors is an integer number (12051048).

Almost surely, 2^40170155 is an apocalyptic number.

40170155 is a deficient number, since it is larger than the sum of its proper divisors (8034037).

40170155 is an equidigital number, since it uses as much as digits as its factorization.

40170155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8034036.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 40170155 is about 6337.9929788538. The cubic root of 40170155 is about 342.4794382669.

Adding to 40170155 its reverse (55107104), we get a palindrome (95277259).

The spelling of 40170155 in words is "forty million, one hundred seventy thousand, one hundred fifty-five".