40015550 has 12 divisors (see below), whose sum is σ = 74429016. Its totient is φ = 16006200.

The previous prime is 40015543. The next prime is 40015559. The reversal of 40015550 is 5551004.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 400106 + ... + 400205.

It is an arithmetic number, because the mean of its divisors is an integer number (6202418).

Almost surely, 2^40015550 is an apocalyptic number.

40015550 is a deficient number, since it is larger than the sum of its proper divisors (34413466).

40015550 is a wasteful number, since it uses less digits than its factorization.

40015550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800323 (or 800318 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 40015550 is about 6325.7845363243. The cubic root of 40015550 is about 342.0395004705.

Adding to 40015550 its reverse (5551004), we get a palindrome (45566554).

The spelling of 40015550 in words is "forty million, fifteen thousand, five hundred fifty".