1904640 has 104 divisors (see below), whose sum is σ = 6290688. Its totient is φ = 491520.

The previous prime is 1904621. The next prime is 1904647. The reversal of 1904640 is 464091.

1904640 = T₄₅₁ + T₄₅₂ + ... + T₄₆₈.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 1904640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1904647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61425 + ... + 61455.

2^1904640 is an apocalyptic number.

1904640 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 1904640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3145344).

1904640 is an abundant number, since it is smaller than the sum of its proper divisors (4386048).

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

1904640 is an equidigital number, since it uses as much as digits as its factorization.

1904640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1904640 is about 1380.0869537823. The cubic root of 1904640 is about 123.9569743199.

The spelling of 1904640 in words is "one million, nine hundred four thousand, six hundred forty".