40278644849 has 4 divisors (see below), whose sum is σ = 40279242240. Its totient is φ = 40278047460.

The previous prime is 40278644837. The next prime is 40278644869. The reversal of 40278644849 is 94844687204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40278644849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40278644794 and 40278644803.

It is not an unprimeable number, because it can be changed into a prime (40278644869) 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, 182489 + ... + 337430.

It is an arithmetic number, because the mean of its divisors is an integer number (10069810560).

Almost surely, 2^40278644849 is an apocalyptic number.

It is an amenable number.

40278644849 is a deficient number, since it is larger than the sum of its proper divisors (597391).

40278644849 is an equidigital number, since it uses as much as digits as its factorization.

40278644849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597390.

The product of its (nonzero) digits is 12386304, while the sum is 56.

The spelling of 40278644849 in words is "forty billion, two hundred seventy-eight million, six hundred forty-four thousand, eight hundred forty-nine".