1621426332 has 24 divisors (see below), whose sum is σ = 3982451200. Its totient is φ = 512029296.

The previous prime is 1621426277. The next prime is 1621426343. The reversal of 1621426332 is 2336241261.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1621426332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3555532 + ... + 3555987.

Almost surely, 2^1621426332 is an apocalyptic number.

1621426332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621426332 is an abundant number, since it is smaller than the sum of its proper divisors (2361024868).

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

1621426332 is a wasteful number, since it uses less digits than its factorization.

1621426332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111545 (or 7111543 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 1621426332 is about 40266.9384483102. The cubic root of 1621426332 is about 1174.8048764870.

Adding to 1621426332 its reverse (2336241261), we get a palindrome (3957667593).

The spelling of 1621426332 in words is "one billion, six hundred twenty-one million, four hundred twenty-six thousand, three hundred thirty-two".