1421551432 has 64 divisors (see below), whose sum is σ = 3214598400. Its totient is φ = 576153600.

The previous prime is 1421551429. The next prime is 1421551457. The reversal of 1421551432 is 2341551241.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1421551432.

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, 108432 + ... + 120832.

It is an arithmetic number, because the mean of its divisors is an integer number (50228100).

Almost surely, 2^1421551432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421551432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607299200).

1421551432 is an abundant number, since it is smaller than the sum of its proper divisors (1793046968).

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

1421551432 is a wasteful number, since it uses less digits than its factorization.

1421551432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12526 (or 12522 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 1421551432 is about 37703.4671084769. The cubic root of 1421551432 is about 1124.4000572702.

The spelling of 1421551432 in words is "one billion, four hundred twenty-one million, five hundred fifty-one thousand, four hundred thirty-two".