40088920891 has 4 divisors (see below), whose sum is σ = 40241350512. Its totient is φ = 39936491272.

The previous prime is 40088920873. The next prime is 40088920951. The reversal of 40088920891 is 19802988004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40088920891 - 2⁷ = 40088920763 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40088920831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76214416 + ... + 76214941.

It is an arithmetic number, because the mean of its divisors is an integer number (10060337628).

Almost surely, 2^40088920891 is an apocalyptic number.

40088920891 is a deficient number, since it is larger than the sum of its proper divisors (152429621).

40088920891 is a wasteful number, since it uses less digits than its factorization.

40088920891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152429620.

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 40088920891 in words is "forty billion, eighty-eight million, nine hundred twenty thousand, eight hundred ninety-one".