40081555 has 8 divisors (see below), whose sum is σ = 48196512. Its totient is φ = 31999488.

The previous prime is 40081513. The next prime is 40081607. The reversal of 40081555 is 55518004.

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 40081555 - 2⁹ = 40081043 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, 5454 + ... + 10483.

It is an arithmetic number, because the mean of its divisors is an integer number (6024564).

Almost surely, 2^40081555 is an apocalyptic number.

40081555 is a deficient number, since it is larger than the sum of its proper divisors (8114957).

40081555 is a wasteful number, since it uses less digits than its factorization.

40081555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16445.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 40081555 is about 6330.9995261412. Note that the first 3 decimals coincide. The cubic root of 40081555 is about 342.2274600304.

Adding to 40081555 its reverse (55518004), we get a palindrome (95599559).

The spelling of 40081555 in words is "forty million, eighty-one thousand, five hundred fifty-five".