1545321420 has 144 divisors (see below), whose sum is σ = 4986334080. Its totient is φ = 386039808.

The previous prime is 1545321397. The next prime is 1545321439. The reversal of 1545321420 is 241235451.

It is a super-2 number, since 2×1545321420² = 4776036582221632800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 730284 + ... + 732396.

It is an arithmetic number, because the mean of its divisors is an integer number (34627320).

Almost surely, 2^1545321420 is an apocalyptic number.

1545321420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1545321420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2493167040).

1545321420 is an abundant number, since it is smaller than the sum of its proper divisors (3441012660).

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

1545321420 is a wasteful number, since it uses less digits than its factorization.

1545321420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2379 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1545321420 is about 39310.5764394266. The cubic root of 1545321420 is about 1156.1289461969.

Adding to 1545321420 its reverse (241235451), we get a palindrome (1786556871).

The spelling of 1545321420 in words is "one billion, five hundred forty-five million, three hundred twenty-one thousand, four hundred twenty".