40284981 has 24 divisors (see below), whose sum is σ = 63928800. Its totient is φ = 24242400.

The previous prime is 40284967. The next prime is 40284991. The reversal of 40284981 is 18948204.

It is not a de Polignac number, because 40284981 - 2¹⁵ = 40252213 is a prime.

It is a super-2 number, since 2×40284981² = 3245759388340722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40284991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13386 + ... + 16116.

It is an arithmetic number, because the mean of its divisors is an integer number (2663700).

Almost surely, 2^40284981 is an apocalyptic number.

It is an amenable number.

40284981 is a deficient number, since it is larger than the sum of its proper divisors (23643819).

40284981 is a wasteful number, since it uses less digits than its factorization.

40284981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897 (or 2894 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 40284981 is about 6347.0450604986. The cubic root of 40284981 is about 342.8054525496.

It can be divided in two parts, 4028 and 4981, that added together give a palindrome (9009).

The spelling of 40284981 in words is "forty million, two hundred eighty-four thousand, nine hundred eighty-one".