621837138 has 16 divisors (see below), whose sum is σ = 1339341696. Its totient is φ = 191334480.

The previous prime is 621837137. The next prime is 621837143. The reversal of 621837138 is 831738126.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 621837096 and 621837105.

It is not an unprimeable number, because it can be changed into a prime (621837137) by changing a digit.

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, 3986058 + ... + 3986213.

It is an arithmetic number, because the mean of its divisors is an integer number (83708856).

Almost surely, 2^621837138 is an apocalyptic number.

621837138 is an abundant number, since it is smaller than the sum of its proper divisors (717504558).

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

621837138 is a wasteful number, since it uses less digits than its factorization.

621837138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7972289.

The product of its digits is 48384, while the sum is 39.

The square root of 621837138 is about 24936.6625272910. The cubic root of 621837138 is about 853.5432888260.

The spelling of 621837138 in words is "six hundred twenty-one million, eight hundred thirty-seven thousand, one hundred thirty-eight".