40751781 has 12 divisors (see below), whose sum is σ = 63207072. Its totient is φ = 23286648.

The previous prime is 40751761. The next prime is 40751797. The reversal of 40751781 is 18715704.

It is not a de Polignac number, because 40751781 - 2¹⁰ = 40750757 is a prime.

It is a super-2 number, since 2×40751781² = 3321415309343922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40751761) 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, 138465 + ... + 138758.

It is an arithmetic number, because the mean of its divisors is an integer number (5267256).

Almost surely, 2^40751781 is an apocalyptic number.

It is an amenable number.

40751781 is a deficient number, since it is larger than the sum of its proper divisors (22455291).

40751781 is a wasteful number, since it uses less digits than its factorization.

40751781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277240 (or 277233 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 40751781 is about 6383.7121645638. The cubic root of 40751781 is about 344.1244507574.

The spelling of 40751781 in words is "forty million, seven hundred fifty-one thousand, seven hundred eighty-one".