40231665 has 12 divisors (see below), whose sum is σ = 69734964. Its totient is φ = 21456864.

The previous prime is 40231657. The next prime is 40231693. The reversal of 40231665 is 56613204.

It can be written as a sum of positive squares in 2 ways, for example, as 23853456 + 16378209 = 4884^2 + 4047^2 .

It is not a de Polignac number, because 40231665 - 2³ = 40231657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 446974 + ... + 447063.

It is an arithmetic number, because the mean of its divisors is an integer number (5811247).

Almost surely, 2^40231665 is an apocalyptic number.

40231665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40231665 is a deficient number, since it is larger than the sum of its proper divisors (29503299).

40231665 is a wasteful number, since it uses less digits than its factorization.

40231665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894048 (or 894045 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 40231665 is about 6342.8436051979. The cubic root of 40231665 is about 342.6541547705.

Adding to 40231665 its reverse (56613204), we get a palindrome (96844869).

The spelling of 40231665 in words is "forty million, two hundred thirty-one thousand, six hundred sixty-five".