40142549 has 2 divisors, whose sum is σ = 40142550. Its totient is φ = 40142548.

The previous prime is 40142533. The next prime is 40142561. The reversal of 40142549 is 94524104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 515524 = 6295^2 + 718^2 .

It is a cyclic number.

It is not a de Polignac number, because 40142549 - 2⁴ = 40142533 is a prime.

It is a super-2 number, since 2×40142549² = 3222848480434802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40142519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20071274 + 20071275.

It is an arithmetic number, because the mean of its divisors is an integer number (20071275).

Almost surely, 2^40142549 is an apocalyptic number.

It is an amenable number.

40142549 is a deficient number, since it is larger than the sum of its proper divisors (1).

40142549 is an equidigital number, since it uses as much as digits as its factorization.

40142549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 40142549 is about 6335.8147858030. The cubic root of 40142549 is about 342.4009666255.

The spelling of 40142549 in words is "forty million, one hundred forty-two thousand, five hundred forty-nine".