3639857402 has 4 divisors (see below), whose sum is σ = 5459786106. Its totient is φ = 1819928700.

The previous prime is 3639857357. The next prime is 3639857407. The reversal of 3639857402 is 2047589363.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3580705921 + 59151481 = 59839^2 + 7691^2 .

It is not an unprimeable number, because it can be changed into a prime (3639857407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909964349 + ... + 909964352.

Almost surely, 2^3639857402 is an apocalyptic number.

3639857402 is a deficient number, since it is larger than the sum of its proper divisors (1819928704).

3639857402 is a wasteful number, since it uses less digits than its factorization.

3639857402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819928703.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 3639857402 is about 60331.2307350016. The cubic root of 3639857402 is about 1538.2542484940.

The spelling of 3639857402 in words is "three billion, six hundred thirty-nine million, eight hundred fifty-seven thousand, four hundred two".