40115385 has 16 divisors (see below), whose sum is σ = 71316480. Its totient is φ = 21394800.

The previous prime is 40115371. The next prime is 40115389. The reversal of 40115385 is 58351104.

It is not a de Polignac number, because 40115385 - 2⁵ = 40115353 is a prime.

It is a super-2 number, since 2×40115385² = 3218488227396450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40115389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148441 + ... + 148710.

It is an arithmetic number, because the mean of its divisors is an integer number (4457280).

Almost surely, 2^40115385 is an apocalyptic number.

40115385 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40115385 is a deficient number, since it is larger than the sum of its proper divisors (31201095).

40115385 is a wasteful number, since it uses less digits than its factorization.

40115385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297165 (or 297159 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 40115385 is about 6333.6707366266. The cubic root of 40115385 is about 342.3237162696.

Adding to 40115385 its reverse (58351104), we get a palindrome (98466489).

The spelling of 40115385 in words is "forty million, one hundred fifteen thousand, three hundred eighty-five".