39998797 has 2 divisors, whose sum is σ = 39998798. Its totient is φ = 39998796.

The previous prime is 39998759. The next prime is 39998831. The reversal of 39998797 is 79789993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33942276 + 6056521 = 5826^2 + 2461^2 .

It is a cyclic number.

It is not a de Polignac number, because 39998797 - 2¹⁵ = 39966029 is a prime.

It is a super-2 number, since 2×39998797² = 3199807522894418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39998197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999398 + 19999399.

It is an arithmetic number, because the mean of its divisors is an integer number (19999399).

Almost surely, 2^39998797 is an apocalyptic number.

It is an amenable number.

39998797 is a deficient number, since it is larger than the sum of its proper divisors (1).

39998797 is an equidigital number, since it uses as much as digits as its factorization.

39998797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 61.

The square root of 39998797 is about 6324.4602141210. The cubic root of 39998797 is about 341.9917607992.

The spelling of 39998797 in words is "thirty-nine million, nine hundred ninety-eight thousand, seven hundred ninety-seven".