40495981 has 8 divisors (see below), whose sum is σ = 41533184. Its totient is φ = 39463200.

The previous prime is 40495957. The next prime is 40495991. The reversal of 40495981 is 18959404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40495981 - 2¹¹ = 40493933 is a prime.

It is a super-2 number, since 2×40495981² = 3279848954304722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40495901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25060 + ... + 26626.

It is an arithmetic number, because the mean of its divisors is an integer number (5191648).

Almost surely, 2^40495981 is an apocalyptic number.

It is an amenable number.

40495981 is a deficient number, since it is larger than the sum of its proper divisors (1037203).

40495981 is a wasteful number, since it uses less digits than its factorization.

40495981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 40495981 is about 6363.6452603834. The cubic root of 40495981 is about 343.4029128679.

The spelling of 40495981 in words is "forty million, four hundred ninety-five thousand, nine hundred eighty-one".