40670381 has 2 divisors, whose sum is σ = 40670382. Its totient is φ = 40670380.

The previous prime is 40670359. The next prime is 40670423. The reversal of 40670381 is 18307604.

40670381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23522500 + 17147881 = 4850^2 + 4141^2 .

It is a cyclic number.

It is not a de Polignac number, because 40670381 - 2¹⁸ = 40408237 is a prime.

It is a super-2 number, since 2×40670381² = 3308159781370322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40670321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20335190 + 20335191.

It is an arithmetic number, because the mean of its divisors is an integer number (20335191).

Almost surely, 2^40670381 is an apocalyptic number.

It is an amenable number.

40670381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40670381 is an equidigital number, since it uses as much as digits as its factorization.

40670381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 40670381 is about 6377.3333768904. Note that the first 4 decimals coincide. The cubic root of 40670381 is about 343.8951732380.

Adding to 40670381 its reverse (18307604), we get a palindrome (58977985).

The spelling of 40670381 in words is "forty million, six hundred seventy thousand, three hundred eighty-one".