40015555 has 4 divisors (see below), whose sum is σ = 48018672. Its totient is φ = 32012440.

The previous prime is 40015543. The next prime is 40015559. The reversal of 40015555 is 55551004.

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

It is not a de Polignac number, because 40015555 - 2¹¹ = 40013507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40015559) 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, 4001551 + ... + 4001560.

It is an arithmetic number, because the mean of its divisors is an integer number (12004668).

Almost surely, 2^40015555 is an apocalyptic number.

40015555 is a deficient number, since it is larger than the sum of its proper divisors (8003117).

40015555 is an equidigital number, since it uses as much as digits as its factorization.

40015555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8003116.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 40015555 is about 6325.7849315322. The cubic root of 40015555 is about 342.0395147166.

Adding to 40015555 its reverse (55551004), we get a palindrome (95566559).

The spelling of 40015555 in words is "forty million, fifteen thousand, five hundred fifty-five".