40142621 has 2 divisors, whose sum is σ = 40142622. Its totient is φ = 40142620.

The previous prime is 40142617. The next prime is 40142623. The reversal of 40142621 is 12624104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32330596 + 7812025 = 5686^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 40142621 - 2² = 40142617 is a prime.

It is a super-2 number, since 2×40142621² = 3222860041499282, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40142623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40142593 and 40142602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40142623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20071310 + 20071311.

It is an arithmetic number, because the mean of its divisors is an integer number (20071311).

Almost surely, 2^40142621 is an apocalyptic number.

It is an amenable number.

40142621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40142621 is an equidigital number, since it uses as much as digits as its factorization.

40142621 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 40142621 is about 6335.8204677847. The cubic root of 40142621 is about 342.4011713365.

Adding to 40142621 its reverse (12624104), we get a palindrome (52766725).

The spelling of 40142621 in words is "forty million, one hundred forty-two thousand, six hundred twenty-one".