40878949391 has 16 divisors (see below), whose sum is σ = 48219790080. Its totient is φ = 33931085760.

The previous prime is 40878949351. The next prime is 40878949403. The reversal of 40878949391 is 19394987804.

It is a cyclic number.

It is not a de Polignac number, because 40878949391 - 2⁶ = 40878949327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40878949351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710990 + ... + 766331.

It is an arithmetic number, because the mean of its divisors is an integer number (3013736880).

Almost surely, 2^40878949391 is an apocalyptic number.

40878949391 is a deficient number, since it is larger than the sum of its proper divisors (7340840689).

40878949391 is a wasteful number, since it uses less digits than its factorization.

40878949391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477454.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 40878949391 in words is "forty billion, eight hundred seventy-eight million, nine hundred forty-nine thousand, three hundred ninety-one".