40010399 has 16 divisors (see below), whose sum is σ = 47585664. Its totient is φ = 33160800.

The previous prime is 40010393. The next prime is 40010441. The reversal of 40010399 is 99301004.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40010399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40010393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10184 + ... + 13554.

It is an arithmetic number, because the mean of its divisors is an integer number (2974104).

Almost surely, 2^40010399 is an apocalyptic number.

40010399 is a deficient number, since it is larger than the sum of its proper divisors (7575265).

40010399 is a wasteful number, since it uses less digits than its factorization.

40010399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 40010399 is about 6325.3773800462. The cubic root of 40010399 is about 342.0248235006.

Subtracting 40010399 from its reverse (99301004), we obtain a triangular number (59290605 = T₁₀₈₈₉).

The spelling of 40010399 in words is "forty million, ten thousand, three hundred ninety-nine".