1398265650 has 72 divisors (see below), whose sum is σ = 3798992340. Its totient is φ = 368670720.

The previous prime is 1398265643. The next prime is 1398265667. The reversal of 1398265650 is 565628931.

1398265650 is a `hidden beast` number, since 1 + 3 + 9 + 82 + 6 + 565 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 285576201 + 1112689449 = 16899^2 + 33357^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1398265596 and 1398265605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22594 + ... + 57506.

Almost surely, 2^1398265650 is an apocalyptic number.

1398265650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398265650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1899496170).

1398265650 is an abundant number, since it is smaller than the sum of its proper divisors (2400726690).

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

1398265650 is a wasteful number, since it uses less digits than its factorization.

1398265650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35020 (or 35012 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 1398265650 is about 37393.3904587428. The cubic root of 1398265650 is about 1118.2267992469.

The spelling of 1398265650 in words is "one billion, three hundred ninety-eight million, two hundred sixty-five thousand, six hundred fifty".