40356981 has 32 divisors (see below), whose sum is σ = 69370880. Its totient is φ = 22709808.

The previous prime is 40356971. The next prime is 40356983. The reversal of 40356981 is 18965304.

It is not a de Polignac number, because 40356981 - 2⁵ = 40356949 is a prime.

It is a super-2 number, since 2×40356981² = 3257371830868722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40356983) 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, 11070 + ... + 14256.

It is an arithmetic number, because the mean of its divisors is an integer number (2167840).

Almost surely, 2^40356981 is an apocalyptic number.

It is an amenable number.

40356981 is a deficient number, since it is larger than the sum of its proper divisors (29013899).

40356981 is a wasteful number, since it uses less digits than its factorization.

40356981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270 (or 3264 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 40356981 is about 6352.7144591899. The cubic root of 40356981 is about 343.0095592425.

The spelling of 40356981 in words is "forty million, three hundred fifty-six thousand, nine hundred eighty-one".