40638707397 has 24 divisors (see below), whose sum is σ = 60933862080. Its totient is φ = 27066026880.

The previous prime is 40638707393. The next prime is 40638707449. The reversal of 40638707397 is 79370783604.

It is a happy number.

40638707397 is a `hidden beast` number, since 406 + 3 + 87 + 0 + 73 + 97 = 666.

40638707397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40638707397 - 2² = 40638707393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638707393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169429 + ... + 331637.

It is an arithmetic number, because the mean of its divisors is an integer number (2538910920).

Almost surely, 2^40638707397 is an apocalyptic number.

It is an amenable number.

40638707397 is a deficient number, since it is larger than the sum of its proper divisors (20295154683).

40638707397 is a wasteful number, since it uses less digits than its factorization.

40638707397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163255 (or 163243 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 54.

The spelling of 40638707397 in words is "forty billion, six hundred thirty-eight million, seven hundred seven thousand, three hundred ninety-seven".