40021040692 has 6 divisors (see below), whose sum is σ = 70036821218. Its totient is φ = 20010520344.

The previous prime is 40021040687. The next prime is 40021040693. The reversal of 40021040692 is 29604012004.

It can be written as a sum of positive squares in only one way, i.e., 24287352336 + 15733688356 = 155844^2 + 125434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40021040692.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021040693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5002630083 + ... + 5002630090.

Almost surely, 2^40021040692 is an apocalyptic number.

It is an amenable number.

40021040692 is a deficient number, since it is larger than the sum of its proper divisors (30015780526).

40021040692 is a wasteful number, since it uses less digits than its factorization.

40021040692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005260177 (or 10005260175 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 40021040692 its reverse (29604012004), we get a palindrome (69625052696).

The spelling of 40021040692 in words is "forty billion, twenty-one million, forty thousand, six hundred ninety-two".