1604398040 has 64 divisors (see below), whose sum is σ = 4165724160. Its totient is φ = 544728960.

The previous prime is 1604398039. The next prime is 1604398043. The reversal of 1604398040 is 408934061.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604398043) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1025 + ... + 56655.

It is an arithmetic number, because the mean of its divisors is an integer number (65089440).

Almost surely, 2^1604398040 is an apocalyptic number.

1604398040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604398040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2082862080).

1604398040 is an abundant number, since it is smaller than the sum of its proper divisors (2561326120).

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

1604398040 is a wasteful number, since it uses less digits than its factorization.

1604398040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55752 (or 55748 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1604398040 is about 40054.9377730137. The cubic root of 1604398040 is about 1170.6777771102.

The spelling of 1604398040 in words is "one billion, six hundred four million, three hundred ninety-eight thousand, forty".