623394840 has 128 divisors (see below), whose sum is σ = 1929692160. Its totient is φ = 161025024.

The previous prime is 623394803. The next prime is 623394853. The reversal of 623394840 is 48493326.

It is a super-2 number, since 2×623394840² = 777242253077251200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 602964 + ... + 603996.

It is an arithmetic number, because the mean of its divisors is an integer number (15075720).

Almost surely, 2^623394840 is an apocalyptic number.

623394840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623394840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964846080).

623394840 is an abundant number, since it is smaller than the sum of its proper divisors (1306297320).

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

623394840 is a wasteful number, since it uses less digits than its factorization.

623394840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 623394840 is about 24967.8761611796. The cubic root of 623394840 is about 854.2554031732.

The spelling of 623394840 in words is "six hundred twenty-three million, three hundred ninety-four thousand, eight hundred forty".