40019906 has 8 divisors (see below), whose sum is σ = 60226320. Its totient is φ = 19944468.

The previous prime is 40019897. The next prime is 40019911. The reversal of 40019906 is 60991004.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31976 + ... + 33203.

It is an arithmetic number, because the mean of its divisors is an integer number (7528290).

Almost surely, 2^40019906 is an apocalyptic number.

40019906 is a deficient number, since it is larger than the sum of its proper divisors (20206414).

40019906 is a wasteful number, since it uses less digits than its factorization.

40019906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65488.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 40019906 is about 6326.1288320742. The cubic root of 40019906 is about 342.0519112292.

The spelling of 40019906 in words is "forty million, nineteen thousand, nine hundred six".