40402066 has 8 divisors (see below), whose sum is σ = 60989580. Its totient is φ = 20072208.

The previous prime is 40402057. The next prime is 40402067. The reversal of 40402066 is 66020404.

It can be written as a sum of positive squares in 2 ways, for example, as 32251041 + 8151025 = 5679^2 + 2855^2 .

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

It is not an unprimeable number, because it can be changed into a prime (40402067) 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, 64021 + ... + 64648.

Almost surely, 2^40402066 is an apocalyptic number.

40402066 is a deficient number, since it is larger than the sum of its proper divisors (20587514).

40402066 is a wasteful number, since it uses less digits than its factorization.

40402066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128828.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 40402066 is about 6356.2619518078. The cubic root of 40402066 is about 343.1372433126.

The spelling of 40402066 in words is "forty million, four hundred two thousand, sixty-six".