40666398 has 8 divisors (see below), whose sum is σ = 81332808. Its totient is φ = 13555464.

The previous prime is 40666391. The next prime is 40666411. The reversal of 40666398 is 89366604.

It is a sphenic number, since it is the product of 3 distinct primes.

40666398 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40666391) 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, 3388861 + ... + 3388872.

It is an arithmetic number, because the mean of its divisors is an integer number (10166601).

Almost surely, 2^40666398 is an apocalyptic number.

40666398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40666398 is a wasteful number, since it uses less digits than its factorization.

40666398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6777738.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 40666398 is about 6377.0210913874. The cubic root of 40666398 is about 343.8839465651.

The spelling of 40666398 in words is "forty million, six hundred sixty-six thousand, three hundred ninety-eight".