3900389881 has 2 divisors, whose sum is σ = 3900389882. Its totient is φ = 3900389880.

The previous prime is 3900389869. The next prime is 3900389903. The reversal of 3900389881 is 1889830093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3784095225 + 116294656 = 61515^2 + 10784^2 .

It is a cyclic number.

It is not a de Polignac number, because 3900389881 - 2¹⁵ = 3900357113 is a prime.

It is a super-2 number, since 2×3900389881² = 30426082447614388322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3900389861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1950194940 + 1950194941.

It is an arithmetic number, because the mean of its divisors is an integer number (1950194941).

Almost surely, 2^3900389881 is an apocalyptic number.

It is an amenable number.

3900389881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3900389881 is an equidigital number, since it uses as much as digits as its factorization.

3900389881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 3900389881 is about 62453.1014522097. The cubic root of 3900389881 is about 1574.1133675712.

The spelling of 3900389881 in words is "three billion, nine hundred million, three hundred eighty-nine thousand, eight hundred eighty-one".