40391021406 has 8 divisors (see below), whose sum is σ = 80782042824. Its totient is φ = 13463673800.

The previous prime is 40391021357. The next prime is 40391021449. The reversal of 40391021406 is 60412019304.

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

40391021406 is an admirable number.

It is a super-2 number, since 2×40391021406² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 3365918445 + ... + 3365918456.

It is an arithmetic number, because the mean of its divisors is an integer number (10097755353).

Almost surely, 2^40391021406 is an apocalyptic number.

40391021406 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.

40391021406 is a wasteful number, since it uses less digits than its factorization.

40391021406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731836906.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 40391021406 in words is "forty billion, three hundred ninety-one million, twenty-one thousand, four hundred six".