40781830 has 16 divisors (see below), whose sum is σ = 75939120. Its totient is φ = 15750112.

The previous prime is 40781821. The next prime is 40781831. The reversal of 40781830 is 3818704.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 40781792 and 40781801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40781831) 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, 70024 + ... + 70603.

It is an arithmetic number, because the mean of its divisors is an integer number (4746195).

Almost surely, 2^40781830 is an apocalyptic number.

40781830 is a deficient number, since it is larger than the sum of its proper divisors (35157290).

40781830 is a wasteful number, since it uses less digits than its factorization.

40781830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140663.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 40781830 is about 6386.0652987579. The cubic root of 40781830 is about 344.2090119291.

The spelling of 40781830 in words is "forty million, seven hundred eighty-one thousand, eight hundred thirty".