39981049 has 2 divisors, whose sum is σ = 39981050. Its totient is φ = 39981048.

The previous prime is 39981043. The next prime is 39981083. The reversal of 39981049 is 94018993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32319225 + 7661824 = 5685^2 + 2768^2 .

It is a cyclic number.

It is not a de Polignac number, because 39981049 - 2¹¹ = 39979001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39980996 and 39981014.

It is not a weakly prime, because it can be changed into another prime (39981043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19990524 + 19990525.

It is an arithmetic number, because the mean of its divisors is an integer number (19990525).

Almost surely, 2^39981049 is an apocalyptic number.

It is an amenable number.

39981049 is a deficient number, since it is larger than the sum of its proper divisors (1).

39981049 is an equidigital number, since it uses as much as digits as its factorization.

39981049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 39981049 is about 6323.0569347429. The cubic root of 39981049 is about 341.9411712134.

The spelling of 39981049 in words is "thirty-nine million, nine hundred eighty-one thousand, forty-nine".