1604401986 has 32 divisors (see below), whose sum is σ = 3559852800. Its totient is φ = 477940880.

The previous prime is 1604401973. The next prime is 1604401987. The reversal of 1604401986 is 6891044061.

1604401986 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1604401987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202116 + ... + 209903.

It is an arithmetic number, because the mean of its divisors is an integer number (111245400).

Almost surely, 2^1604401986 is an apocalyptic number.

1604401986 is an abundant number, since it is smaller than the sum of its proper divisors (1955450814).

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

1604401986 is a wasteful number, since it uses less digits than its factorization.

1604401986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412094.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1604401986 is about 40054.9870303312. The cubic root of 1604401986 is about 1170.6787368660.

The spelling of 1604401986 in words is "one billion, six hundred four million, four hundred one thousand, nine hundred eighty-six".