40689999 has 64 divisors (see below), whose sum is σ = 72576000. Its totient is φ = 22049280.

The previous prime is 40689983. The next prime is 40690007. The reversal of 40689999 is 99998604.

40689999 = T₂ + T₃ + ... + T₆₂₄.

It is a happy number.

It is not a de Polignac number, because 40689999 - 2⁴ = 40689983 is a prime.

40689999 is a modest number, since divided by 9999 gives 4068 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40689799) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 457147 + ... + 457235.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^40689999 is an apocalyptic number.

40689999 is a deficient number, since it is larger than the sum of its proper divisors (31886001).

40689999 is a wasteful number, since it uses less digits than its factorization.

40689999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 40689999 is about 6378.8712951431. The cubic root of 40689999 is about 343.9504587706.

The spelling of 40689999 in words is "forty million, six hundred eighty-nine thousand, nine hundred ninety-nine".