840245400 has 384 divisors, whose sum is σ = 3129710400. Its totient is φ = 209018880.

The previous prime is 840245381. The next prime is 840245423. The reversal of 840245400 is 4542048.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7435744 + ... + 7435856.

Almost surely, 2^840245400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840245400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1564855200).

840245400 is an abundant number, since it is smaller than the sum of its proper divisors (2289465000).

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

840245400 is a wasteful number, since it uses less digits than its factorization.

840245400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 840245400 is about 28986.9867354301. The cubic root of 840245400 is about 943.6306698237.

Adding to 840245400 its reverse (4542048), we get a palindrome (844787448).

The spelling of 840245400 in words is "eight hundred forty million, two hundred forty-five thousand, four hundred".