40220381 has 2 divisors, whose sum is σ = 40220382. Its totient is φ = 40220380.

The previous prime is 40220329. The next prime is 40220387. The reversal of 40220381 is 18302204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40208281 + 12100 = 6341^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40220381 is a prime.

It is a super-2 number, since 2×40220381² = 3235358095570322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40220387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110190 + 20110191.

It is an arithmetic number, because the mean of its divisors is an integer number (20110191).

Almost surely, 2^40220381 is an apocalyptic number.

It is an amenable number.

40220381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40220381 is an equidigital number, since it uses as much as digits as its factorization.

40220381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 40220381 is about 6341.9540364150. The cubic root of 40220381 is about 342.6221163995.

Adding to 40220381 its reverse (18302204), we get a palindrome (58522585).

The spelling of 40220381 in words is "forty million, two hundred twenty thousand, three hundred eighty-one".