621998134 has 16 divisors (see below), whose sum is σ = 937943136. Its totient is φ = 309355200.

The previous prime is 621998107. The next prime is 621998161. The reversal of 621998134 is 431899126.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (621998107) and next prime (621998161).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470194 + ... + 471514.

It is an arithmetic number, because the mean of its divisors is an integer number (58621446).

Almost surely, 2^621998134 is an apocalyptic number.

621998134 is a deficient number, since it is larger than the sum of its proper divisors (315945002).

621998134 is a wasteful number, since it uses less digits than its factorization.

621998134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391.

The product of its digits is 93312, while the sum is 43.

The square root of 621998134 is about 24939.8904167601. The cubic root of 621998134 is about 853.6169443377.

The spelling of 621998134 in words is "six hundred twenty-one million, nine hundred ninety-eight thousand, one hundred thirty-four".