155583920 has 20 divisors (see below), whose sum is σ = 361732800. Its totient is φ = 62233536.

The previous prime is 155583893. The next prime is 155583931. The reversal of 155583920 is 29385551.

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

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, 972320 + ... + 972479.

It is an arithmetic number, because the mean of its divisors is an integer number (18086640).

Almost surely, 2^155583920 is an apocalyptic number.

155583920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155583920 is an abundant number, since it is smaller than the sum of its proper divisors (206148880).

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

155583920 is a wasteful number, since it uses less digits than its factorization.

155583920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944812 (or 1944806 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 155583920 is about 12473.3283449126. The cubic root of 155583920 is about 537.8422352648.

The spelling of 155583920 in words is "one hundred fifty-five million, five hundred eighty-three thousand, nine hundred twenty".