1551433420 has 48 divisors (see below), whose sum is σ = 3281660928. Its totient is φ = 616089600.

The previous prime is 1551433381. The next prime is 1551433439. The reversal of 1551433420 is 243341551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2581120 + ... + 2581720.

It is an arithmetic number, because the mean of its divisors is an integer number (68367936).

Almost surely, 2^1551433420 is an apocalyptic number.

1551433420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551433420 is an abundant number, since it is smaller than the sum of its proper divisors (1730227508).

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

1551433420 is a wasteful number, since it uses less digits than its factorization.

1551433420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1328 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1551433420 is about 39388.2396153979. The cubic root of 1551433420 is about 1157.6511676954.

Adding to 1551433420 its reverse (243341551), we get a palindrome (1794774971).

The spelling of 1551433420 in words is "one billion, five hundred fifty-one million, four hundred thirty-three thousand, four hundred twenty".