1545220 has 12 divisors (see below), whose sum is σ = 3245004. Its totient is φ = 618080.

The previous prime is 1545217. The next prime is 1545233. The reversal of 1545220 is 225451.

It can be written as a sum of positive squares in 2 ways, for example, as 876096 + 669124 = 936^2 + 818^2 .

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, 38611 + ... + 38650.

It is an arithmetic number, because the mean of its divisors is an integer number (270417).

2^1545220 is an apocalyptic number.

1545220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1545220 is an abundant number, since it is smaller than the sum of its proper divisors (1699784).

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

1545220 is a wasteful number, since it uses less digits than its factorization.

1545220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77270 (or 77268 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1545220 is about 1243.0687832940. The cubic root of 1545220 is about 115.6103653258.

It can be divided in two parts, 1545 and 220, that multiplied together give a triangular number (339900 = T₈₂₄).

The spelling of 1545220 in words is "one million, five hundred forty-five thousand, two hundred twenty".