40212155 has 8 divisors (see below), whose sum is σ = 49558992. Its totient is φ = 31300128.

The previous prime is 40212149. The next prime is 40212167. The reversal of 40212155 is 55121204.

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 40212155 - 2⁶ = 40212091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108497 + ... + 108866.

It is an arithmetic number, because the mean of its divisors is an integer number (6194874).

Almost surely, 2^40212155 is an apocalyptic number.

40212155 is a deficient number, since it is larger than the sum of its proper divisors (9346837).

40212155 is a wasteful number, since it uses less digits than its factorization.

40212155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217405.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 40212155 is about 6341.3054649654. The cubic root of 40212155 is about 342.5987567526.

Adding to 40212155 its reverse (55121204), we get a palindrome (95333359).

The spelling of 40212155 in words is "forty million, two hundred twelve thousand, one hundred fifty-five".