1639421802 has 32 divisors (see below), whose sum is σ = 3834907200. Its totient is φ = 517711824.

The previous prime is 1639421779. The next prime is 1639421837. The reversal of 1639421802 is 2081249361.

1639421802 is a `hidden beast` number, since 1 + 639 + 4 + 2 + 18 + 0 + 2 = 666.

It is a super-3 number, since 3×1639421802³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797913 + ... + 799964.

It is an arithmetic number, because the mean of its divisors is an integer number (119840850).

Almost surely, 2^1639421802 is an apocalyptic number.

1639421802 is an abundant number, since it is smaller than the sum of its proper divisors (2195485398).

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

1639421802 is a wasteful number, since it uses less digits than its factorization.

1639421802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597907 (or 1597901 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1639421802 is about 40489.7740423431. The cubic root of 1639421802 is about 1179.1351035537.

The spelling of 1639421802 in words is "one billion, six hundred thirty-nine million, four hundred twenty-one thousand, eight hundred two".