40987281 has 4 divisors (see below), whose sum is σ = 54649712. Its totient is φ = 27324852.

The previous prime is 40987279. The next prime is 40987283. The reversal of 40987281 is 18278904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40987279) and next prime (40987283).

It is not a de Polignac number, because 40987281 - 2¹ = 40987279 is a prime.

It is a super-2 number, since 2×40987281² = 3359914407545922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40987283) 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, 6831211 + ... + 6831216.

It is an arithmetic number, because the mean of its divisors is an integer number (13662428).

Almost surely, 2^40987281 is an apocalyptic number.

It is an amenable number.

40987281 is a deficient number, since it is larger than the sum of its proper divisors (13662431).

40987281 is a wasteful number, since it uses less digits than its factorization.

40987281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13662430.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 40987281 is about 6402.1309733557. The cubic root of 40987281 is about 344.7860635415.

The spelling of 40987281 in words is "forty million, nine hundred eighty-seven thousand, two hundred eighty-one".