40688999 has 4 divisors (see below), whose sum is σ = 43818936. Its totient is φ = 37559064.

The previous prime is 40688987. The next prime is 40689037. The reversal of 40688999 is 99988604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40688999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 40688999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40688099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1564949 + ... + 1564974.

It is an arithmetic number, because the mean of its divisors is an integer number (10954734).

Almost surely, 2^40688999 is an apocalyptic number.

40688999 is a deficient number, since it is larger than the sum of its proper divisors (3129937).

40688999 is a wasteful number, since it uses less digits than its factorization.

40688999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129936.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 40688999 is about 6378.7929108884. The cubic root of 40688999 is about 343.9476410981.

The spelling of 40688999 in words is "forty million, six hundred eighty-eight thousand, nine hundred ninety-nine".