40806401690 has 32 divisors (see below), whose sum is σ = 79669097424. Its totient is φ = 14987714560.

The previous prime is 40806401683. The next prime is 40806401719. The reversal of 40806401690 is 9610460804.

It can be written as a sum of positive squares in 8 ways, for example, as 16865957161 + 23940444529 = 129869^2 + 154727^2 .

It is a super-2 number, since 2×40806401690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2920319 + ... + 2934258.

Almost surely, 2^40806401690 is an apocalyptic number.

40806401690 is a deficient number, since it is larger than the sum of its proper divisors (38862695734).

40806401690 is a wasteful number, since it uses less digits than its factorization.

40806401690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5854642.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 40806401690 in words is "forty billion, eight hundred six million, four hundred one thousand, six hundred ninety".