1398501720 has 512 divisors, whose sum is σ = 5922201600. Its totient is φ = 285120000.

The previous prime is 1398501703. The next prime is 1398501781. The reversal of 1398501720 is 271058931.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 5571595 + ... + 5571845.

It is an arithmetic number, because the mean of its divisors is an integer number (11566800).

Almost surely, 2^1398501720 is an apocalyptic number.

1398501720 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 1398501720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2961100800).

1398501720 is an abundant number, since it is smaller than the sum of its proper divisors (4523699880).

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

1398501720 is a wasteful number, since it uses less digits than its factorization.

1398501720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1398501720 is about 37396.5468994131. The cubic root of 1398501720 is about 1118.2897259986.

The spelling of 1398501720 in words is "one billion, three hundred ninety-eight million, five hundred one thousand, seven hundred twenty".