40243157 has 4 divisors (see below), whose sum is σ = 40343916. Its totient is φ = 40142400.

The previous prime is 40243117. The next prime is 40243163. The reversal of 40243157 is 75134204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28313041 + 11930116 = 5321^2 + 3454^2 .

It is a cyclic number.

It is not a de Polignac number, because 40243157 - 2²² = 36048853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40243117) 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, 49778 + ... + 50579.

It is an arithmetic number, because the mean of its divisors is an integer number (10085979).

Almost surely, 2^40243157 is an apocalyptic number.

It is an amenable number.

40243157 is a deficient number, since it is larger than the sum of its proper divisors (100759).

40243157 is a wasteful number, since it uses less digits than its factorization.

40243157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100758.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 40243157 is about 6343.7494433497. The cubic root of 40243157 is about 342.6867775538.

The spelling of 40243157 in words is "forty million, two hundred forty-three thousand, one hundred fifty-seven".