1398894840 has 512 divisors, whose sum is σ = 5662310400. Its totient is φ = 300464640.

The previous prime is 1398894829. The next prime is 1398894857. The reversal of 1398894840 is 484988931.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11014857 + ... + 11014983.

It is an arithmetic number, because the mean of its divisors is an integer number (11059200).

Almost surely, 2^1398894840 is an apocalyptic number.

1398894840 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 1398894840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2831155200).

1398894840 is an abundant number, since it is smaller than the sum of its proper divisors (4263415560).

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

1398894840 is a wasteful number, since it uses less digits than its factorization.

1398894840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 1398894840 is about 37401.8026303546. The cubic root of 1398894840 is about 1118.3945002400.

The spelling of 1398894840 in words is "one billion, three hundred ninety-eight million, eight hundred ninety-four thousand, eight hundred forty".