3939661550 has 48 divisors (see below), whose sum is σ = 8073193104. Its totient is φ = 1418400000.

The previous prime is 3939661547. The next prime is 3939661553. The reversal of 3939661550 is 551669393.

It is an interprime number because it is at equal distance from previous prime (3939661547) and next prime (3939661553).

It is a junction number, because it is equal to n+sod(n) for n = 3939661495 and 3939661504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939661553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20090 + ... + 91010.

It is an arithmetic number, because the mean of its divisors is an integer number (168191523).

Almost surely, 2^3939661550 is an apocalyptic number.

3939661550 is an abundant number, since it is smaller than the sum of its proper divisors (4133531554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3939661550 is a wasteful number, since it uses less digits than its factorization.

3939661550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71045 (or 71040 counting only the distinct ones).

The product of its (nonzero) digits is 656100, while the sum is 47.

The square root of 3939661550 is about 62766.7232695797. The cubic root of 3939661550 is about 1579.3788016255.

The spelling of 3939661550 in words is "three billion, nine hundred thirty-nine million, six hundred sixty-one thousand, five hundred fifty".