1623412440 has 192 divisors, whose sum is σ = 5981320800. Its totient is φ = 378556416.

The previous prime is 1623412429. The next prime is 1623412447. The reversal of 1623412440 is 442143261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623412447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79792 + ... + 98048.

Almost surely, 2^1623412440 is an apocalyptic number.

1623412440 is a gapful number since it is divisible by the number (10) 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 1623412440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2990660400).

1623412440 is an abundant number, since it is smaller than the sum of its proper divisors (4357908360).

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

1623412440 is a wasteful number, since it uses less digits than its factorization.

1623412440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18306 (or 18299 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1623412440 is about 40291.5926714246. The cubic root of 1623412440 is about 1175.2843591236.

The spelling of 1623412440 in words is "one billion, six hundred twenty-three million, four hundred twelve thousand, four hundred forty".