1521322040 has 32 divisors (see below), whose sum is σ = 3911971680. Its totient is φ = 521596032.

The previous prime is 1521322003. The next prime is 1521322043. The reversal of 1521322040 is 402231251.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521322043) 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, 2716367 + ... + 2716926.

It is an arithmetic number, because the mean of its divisors is an integer number (122249115).

Almost surely, 2^1521322040 is an apocalyptic number.

1521322040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521322040 is an abundant number, since it is smaller than the sum of its proper divisors (2390649640).

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

1521322040 is a wasteful number, since it uses less digits than its factorization.

1521322040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433311 (or 5433307 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1521322040 is about 39004.1284994294. The cubic root of 1521322040 is about 1150.1126644503.

Adding to 1521322040 its reverse (402231251), we get a palindrome (1923553291).

The spelling of 1521322040 in words is "one billion, five hundred twenty-one million, three hundred twenty-two thousand, forty".