40245681 has 32 divisors (see below), whose sum is σ = 65802240. Its totient is φ = 21355776.

The previous prime is 40245679. The next prime is 40245683. The reversal of 40245681 is 18654204.

It is an interprime number because it is at equal distance from previous prime (40245679) and next prime (40245683).

It is not a de Polignac number, because 40245681 - 2¹ = 40245679 is a prime.

It is a super-2 number, since 2×40245681² = 3239429678307522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40245683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27490 + ... + 28916.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^40245681 is an apocalyptic number.

It is an amenable number.

40245681 is a deficient number, since it is larger than the sum of its proper divisors (25556559).

40245681 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (40245680) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1533).

40245681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 40245681 is about 6343.9483762086. The cubic root of 40245681 is about 342.6939416981.

Adding to 40245681 its reverse (18654204), we get a palindrome (58899885).

The spelling of 40245681 in words is "forty million, two hundred forty-five thousand, six hundred eighty-one".