40040399 has 6 divisors (see below), whose sum is σ = 46577664. Its totient is φ = 34320300.

The previous prime is 40040393. The next prime is 40040411. The reversal of 40040399 is 99304004.

It is a happy number.

It is not a de Polignac number, because 40040399 - 2¹² = 40036303 is a prime.

It is a super-3 number, since 3×40040399³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408527 + ... + 408624.

It is an arithmetic number, because the mean of its divisors is an integer number (7762944).

Almost surely, 2^40040399 is an apocalyptic number.

40040399 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

40040399 is a deficient number, since it is larger than the sum of its proper divisors (6537265).

40040399 is an equidigital number, since it uses as much as digits as its factorization.

40040399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817165 (or 817158 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 40040399 is about 6327.7483357036. The cubic root of 40040399 is about 342.1102861262.

The spelling of 40040399 in words is "forty million, forty thousand, three hundred ninety-nine".