3642721402 has 16 divisors (see below), whose sum is σ = 5644783872. Its totient is φ = 1761219360.

The previous prime is 3642721391. The next prime is 3642721493. The reversal of 3642721402 is 2041272463.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58558 + ... + 103510.

It is an arithmetic number, because the mean of its divisors is an integer number (352798992).

Almost surely, 2^3642721402 is an apocalyptic number.

3642721402 is a deficient number, since it is larger than the sum of its proper divisors (2002062470).

3642721402 is a wasteful number, since it uses less digits than its factorization.

3642721402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46293.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 3642721402 is about 60354.9617015867. The cubic root of 3642721402 is about 1538.6575981027.

Adding to 3642721402 its reverse (2041272463), we get a palindrome (5683993865).

The spelling of 3642721402 in words is "three billion, six hundred forty-two million, seven hundred twenty-one thousand, four hundred two".