40438697 has 4 divisors (see below), whose sum is σ = 43549380. Its totient is φ = 37328016.

The previous prime is 40438691. The next prime is 40438703. The reversal of 40438697 is 79683404.

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

It is an interprime number because it is at equal distance from previous prime (40438691) and next prime (40438703).

It can be written as a sum of positive squares in 2 ways, for example, as 26925721 + 13512976 = 5189^2 + 3676^2 .

It is a cyclic number.

It is not a de Polignac number, because 40438697 - 2⁴ = 40438681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40438691) 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, 1555322 + ... + 1555347.

It is an arithmetic number, because the mean of its divisors is an integer number (10887345).

Almost surely, 2^40438697 is an apocalyptic number.

It is an amenable number.

40438697 is a deficient number, since it is larger than the sum of its proper divisors (3110683).

40438697 is a wasteful number, since it uses less digits than its factorization.

40438697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110682.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 40438697 is about 6359.1427881437. The cubic root of 40438697 is about 343.2409151027.

The spelling of 40438697 in words is "forty million, four hundred thirty-eight thousand, six hundred ninety-seven".