1540220 has 24 divisors (see below), whose sum is σ = 3529008. Its totient is φ = 560000.

The previous prime is 1540211. The next prime is 1540223. The reversal of 1540220 is 220451.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1540195 and 1540204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3281 + ... + 3720.

It is an arithmetic number, because the mean of its divisors is an integer number (147042).

2^1540220 is an apocalyptic number.

1540220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540220 is an abundant number, since it is smaller than the sum of its proper divisors (1988788).

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

1540220 is a wasteful number, since it uses less digits than its factorization.

1540220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7021 (or 7019 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1540220 is about 1241.0560019596. The cubic root of 1540220 is about 115.4855338166.

Adding to 1540220 its reverse (220451), we get a palindrome (1760671).

The spelling of 1540220 in words is "one million, five hundred forty thousand, two hundred twenty".