1553840 has 20 divisors (see below), whose sum is σ = 3612864. Its totient is φ = 621504.

The previous prime is 1553837. The next prime is 1553869. The reversal of 1553840 is 483551.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9632 + ... + 9791.

2^1553840 is an apocalyptic number.

1553840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553840 is an abundant number, since it is smaller than the sum of its proper divisors (2059024).

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

1553840 is a wasteful number, since it uses less digits than its factorization.

1553840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19436 (or 19430 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1553840 is about 1246.5311869344. The cubic root of 1553840 is about 115.8249440410.

The spelling of 1553840 in words is "one million, five hundred fifty-three thousand, eight hundred forty".