40123435657 has 8 divisors (see below), whose sum is σ = 40722915584. Its totient is φ = 39527993088.

The previous prime is 40123435633. The next prime is 40123435679. The reversal of 40123435657 is 75653432104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40123435657 - 2³¹ = 37975952009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40123235657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989313 + ... + 1029070.

It is an arithmetic number, because the mean of its divisors is an integer number (5090364448).

Almost surely, 2^40123435657 is an apocalyptic number.

It is an amenable number.

40123435657 is a deficient number, since it is larger than the sum of its proper divisors (599479927).

40123435657 is a wasteful number, since it uses less digits than its factorization.

40123435657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018679.

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 40123435657 in words is "forty billion, one hundred twenty-three million, four hundred thirty-five thousand, six hundred fifty-seven".