39998831 has 2 divisors, whose sum is σ = 39998832. Its totient is φ = 39998830.

The previous prime is 39998797. The next prime is 39998837. The reversal of 39998831 is 13889993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39998831 - 2¹⁰ = 39997807 is a prime.

It is a super-2 number, since 2×39998831² = 3199812962733122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39998831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39998837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999415 + 19999416.

It is an arithmetic number, because the mean of its divisors is an integer number (19999416).

Almost surely, 2^39998831 is an apocalyptic number.

39998831 is a deficient number, since it is larger than the sum of its proper divisors (1).

39998831 is an equidigital number, since it uses as much as digits as its factorization.

39998831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 39998831 is about 6324.4629020969. The cubic root of 39998831 is about 341.9918576997.

The spelling of 39998831 in words is "thirty-nine million, nine hundred ninety-eight thousand, eight hundred thirty-one".