40009215 has 16 divisors (see below), whose sum is σ = 64093536. Its totient is φ = 21312000.

The previous prime is 40009201. The next prime is 40009253. The reversal of 40009215 is 51290004.

It is not a de Polignac number, because 40009215 - 2⁷ = 40009087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40009191 and 40009200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21315 + ... + 23115.

It is an arithmetic number, because the mean of its divisors is an integer number (4005846).

Almost surely, 2^40009215 is an apocalyptic number.

40009215 is a deficient number, since it is larger than the sum of its proper divisors (24084321).

40009215 is a wasteful number, since it uses less digits than its factorization.

40009215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 40009215 is about 6325.2837880999. The cubic root of 40009215 is about 342.0214496994.

Adding to 40009215 its reverse (51290004), we get a palindrome (91299219).

It can be divided in two parts, 400092 and 15, that multiplied together give a triangular number (6001380 = T₃₄₆₄).

The spelling of 40009215 in words is "forty million, nine thousand, two hundred fifteen".