40398238 has 8 divisors (see below), whose sum is σ = 60999120. Its totient is φ = 20065200.

The previous prime is 40398233. The next prime is 40398263. The reversal of 40398238 is 83289304.

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

It is a junction number, because it is equal to n+sod(n) for n = 40398197 and 40398206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40398233) 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, 66583 + ... + 67186.

It is an arithmetic number, because the mean of its divisors is an integer number (7624890).

Almost surely, 2^40398238 is an apocalyptic number.

40398238 is a deficient number, since it is larger than the sum of its proper divisors (20600882).

40398238 is a wasteful number, since it uses less digits than its factorization.

40398238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133922.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 40398238 is about 6355.9608242971. The cubic root of 40398238 is about 343.1264058235.

It can be divided in two parts, 40 and 398238, that added together give a triangular number (398278 = T₈₉₂).

The spelling of 40398238 in words is "forty million, three hundred ninety-eight thousand, two hundred thirty-eight".