40515399 has 6 divisors (see below), whose sum is σ = 58522256. Its totient is φ = 27010260.

The previous prime is 40515361. The next prime is 40515401. The reversal of 40515399 is 99351504.

It is not a de Polignac number, because 40515399 - 2⁷ = 40515271 is a prime.

It is a super-2 number, since 2×40515399² = 3282995112258402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40515599) 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, 2250847 + ... + 2250864.

Almost surely, 2^40515399 is an apocalyptic number.

40515399 is a deficient number, since it is larger than the sum of its proper divisors (18006857).

40515399 is a wasteful number, since it uses less digits than its factorization.

40515399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501717 (or 4501714 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 40515399 is about 6365.1707753995. The cubic root of 40515399 is about 343.4577918301.

The spelling of 40515399 in words is "forty million, five hundred fifteen thousand, three hundred ninety-nine".