1904540 has 36 divisors (see below), whose sum is σ = 4401768. Its totient is φ = 691680.

The previous prime is 1904537. The next prime is 1904543. The reversal of 1904540 is 454091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1904537) and next prime (1904543).

It is a super-2 number, since 2×1904540² = 7254545223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1904543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2027 + ... + 2813.

2^1904540 is an apocalyptic number.

1904540 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 1904540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2200884).

1904540 is an abundant number, since it is smaller than the sum of its proper divisors (2497228).

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

1904540 is a wasteful number, since it uses less digits than its factorization.

1904540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1904540 is about 1380.0507237055. The cubic root of 1904540 is about 123.9548048961.

The spelling of 1904540 in words is "one million, nine hundred four thousand, five hundred forty".