1621139598 has 36 divisors (see below), whose sum is σ = 3803450040. Its totient is φ = 498811248.

The previous prime is 1621139573. The next prime is 1621139609. The reversal of 1621139598 is 8959311261.

1621139598 is a `hidden beast` number, since 1 + 6 + 21 + 1 + 39 + 598 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 263418 + ... + 269501.

It is an arithmetic number, because the mean of its divisors is an integer number (105651390).

Almost surely, 2^1621139598 is an apocalyptic number.

1621139598 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1621139598 is an abundant number, since it is smaller than the sum of its proper divisors (2182310442).

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

1621139598 is a wasteful number, since it uses less digits than its factorization.

1621139598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532953 (or 532937 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1621139598 is about 40263.3778761792. The cubic root of 1621139598 is about 1174.7356213393.

The spelling of 1621139598 in words is "one billion, six hundred twenty-one million, one hundred thirty-nine thousand, five hundred ninety-eight".