40281697 has 2 divisors, whose sum is σ = 40281698. Its totient is φ = 40281696.

The previous prime is 40281649. The next prime is 40281743. The reversal of 40281697 is 79618204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20647936 + 19633761 = 4544^2 + 4431^2 .

It is a cyclic number.

It is not a de Polignac number, because 40281697 - 2²³ = 31893089 is a prime.

It is a super-2 number, since 2×40281697² = 3245230226399618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40281607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20140848 + 20140849.

It is an arithmetic number, because the mean of its divisors is an integer number (20140849).

Almost surely, 2^40281697 is an apocalyptic number.

40281697 is the 3393-rd centered heptagonal number.

It is an amenable number.

40281697 is a deficient number, since it is larger than the sum of its proper divisors (1).

40281697 is an equidigital number, since it uses as much as digits as its factorization.

40281697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 40281697 is about 6346.7863521628. The cubic root of 40281697 is about 342.7961372195.

The spelling of 40281697 in words is "forty million, two hundred eighty-one thousand, six hundred ninety-seven".