1201640004 has 18 divisors (see below), whose sum is σ = 3037478990. Its totient is φ = 400546656.

The previous prime is 1201639987. The next prime is 1201640021. The reversal of 1201640004 is 4000461021.

1201640004 is a `hidden beast` number, since 1 + 20 + 1 + 640 + 0 + 0 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1201639987) and next prime (1201640021).

It can be written as a sum of positive squares in only one way, i.e., 764411904 + 437228100 = 27648^2 + 20910^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16689409 + ... + 16689480.

Almost surely, 2^1201640004 is an apocalyptic number.

It is an amenable number.

1201640004 is an abundant number, since it is smaller than the sum of its proper divisors (1835838986).

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

1201640004 is a wasteful number, since it uses less digits than its factorization.

1201640004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33378899 (or 33378894 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1201640004 is about 34664.6794879168. The cubic root of 1201640004 is about 1063.1424500100.

The spelling of 1201640004 in words is "one billion, two hundred one million, six hundred forty thousand, four".