40191872387 has 4 divisors (see below), whose sum is σ = 41047018656. Its totient is φ = 39336726120.

The previous prime is 40191872327. The next prime is 40191872393. The reversal of 40191872387 is 78327819104.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40191872387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40191872317) 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, 427573064 + ... + 427573157.

It is an arithmetic number, because the mean of its divisors is an integer number (10261754664).

Almost surely, 2^40191872387 is an apocalyptic number.

40191872387 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

40191872387 is a deficient number, since it is larger than the sum of its proper divisors (855146269).

40191872387 is an equidigital number, since it uses as much as digits as its factorization.

40191872387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855146268.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 40191872387 in words is "forty billion, one hundred ninety-one million, eight hundred seventy-two thousand, three hundred eighty-seven".