40669281 has 12 divisors (see below), whose sum is σ = 60770580. Its totient is φ = 26177760.

The previous prime is 40669273. The next prime is 40669289. The reversal of 40669281 is 18296604.

It is an interprime number because it is at equal distance from previous prime (40669273) and next prime (40669289).

It can be written as a sum of positive squares in 2 ways, for example, as 30074256 + 10595025 = 5484^2 + 3255^2 .

It is not a de Polignac number, because 40669281 - 2³ = 40669273 is a prime.

It is a super-2 number, since 2×40669281² = 3307980834113922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (40669289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77650 + ... + 78171.

It is an arithmetic number, because the mean of its divisors is an integer number (5064215).

Almost surely, 2^40669281 is an apocalyptic number.

It is an amenable number.

40669281 is a deficient number, since it is larger than the sum of its proper divisors (20101299).

40669281 is a wasteful number, since it uses less digits than its factorization.

40669281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155856 (or 155853 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 40669281 is about 6377.2471333641. The cubic root of 40669281 is about 343.8920727990.

The spelling of 40669281 in words is "forty million, six hundred sixty-nine thousand, two hundred eighty-one".