1540531220 has 48 divisors (see below), whose sum is σ = 3312852480. Its totient is φ = 601476864.

The previous prime is 1540531217. The next prime is 1540531247. The reversal of 1540531220 is 221350451.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382457 + ... + 386463.

It is an arithmetic number, because the mean of its divisors is an integer number (69017760).

Almost surely, 2^1540531220 is an apocalyptic number.

1540531220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540531220 is an abundant number, since it is smaller than the sum of its proper divisors (1772321260).

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

1540531220 is a wasteful number, since it uses less digits than its factorization.

1540531220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472 (or 4470 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1540531220 is about 39249.6015266397. The cubic root of 1540531220 is about 1154.9331170706.

Adding to 1540531220 its reverse (221350451), we get a palindrome (1761881671).

The spelling of 1540531220 in words is "one billion, five hundred forty million, five hundred thirty-one thousand, two hundred twenty".