40013797 has 2 divisors, whose sum is σ = 40013798. Its totient is φ = 40013796.

The previous prime is 40013773. The next prime is 40013803. The reversal of 40013797 is 79731004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35628961 + 4384836 = 5969^2 + 2094^2 .

It is a cyclic number.

It is not a de Polignac number, because 40013797 - 2⁷ = 40013669 is a prime.

It is a super-2 number, since 2×40013797² = 3202207900714418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40010797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20006898 + 20006899.

It is an arithmetic number, because the mean of its divisors is an integer number (20006899).

Almost surely, 2^40013797 is an apocalyptic number.

It is an amenable number.

40013797 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013797 is an equidigital number, since it uses as much as digits as its factorization.

40013797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 40013797 is about 6325.6459749183. The cubic root of 40013797 is about 342.0345057122.

The spelling of 40013797 in words is "forty million, thirteen thousand, seven hundred ninety-seven".