40385702981 has 8 divisors (see below), whose sum is σ = 43551640440. Its totient is φ = 37228243392.

The previous prime is 40385702977. The next prime is 40385702983. The reversal of 40385702981 is 18920758304.

It is a happy number.

40385702981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2208060100 + 38177642881 = 46990^2 + 195391^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40385702981 - 2² = 40385702977 is a prime.

It is a super-2 number, since 2×40385702981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40385702983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109566 + ... + 2128623.

It is an arithmetic number, because the mean of its divisors is an integer number (5443955055).

Almost surely, 2^40385702981 is an apocalyptic number.

It is an amenable number.

40385702981 is a deficient number, since it is larger than the sum of its proper divisors (3165937459).

40385702981 is a wasteful number, since it uses less digits than its factorization.

40385702981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238935.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 40385702981 in words is "forty billion, three hundred eighty-five million, seven hundred two thousand, nine hundred eighty-one".