1398779284 has 36 divisors (see below), whose sum is σ = 2865049824. Its totient is φ = 595785456.

The previous prime is 1398779281. The next prime is 1398779309. The reversal of 1398779284 is 4829778931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398779281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10057 + ... + 53839.

Almost surely, 2^1398779284 is an apocalyptic number.

1398779284 is a gapful number since it is divisible by the number (14) 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 1398779284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432524912).

1398779284 is an abundant number, since it is smaller than the sum of its proper divisors (1466270540).

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

1398779284 is a wasteful number, since it uses less digits than its factorization.

1398779284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43964 (or 43955 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 58.

The square root of 1398779284 is about 37400.2578065981. The cubic root of 1398779284 is about 1118.3637043217.

The spelling of 1398779284 in words is "one billion, three hundred ninety-eight million, seven hundred seventy-nine thousand, two hundred eighty-four".