1398991700 has 18 divisors (see below), whose sum is σ = 3035812206. Its totient is φ = 559596640.

The previous prime is 1398991669. The next prime is 1398991729. The reversal of 1398991700 is 71998931.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 57820816 + 1341170884 = 7604^2 + 36622^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6994859 + ... + 6995058.

Almost surely, 2^1398991700 is an apocalyptic number.

1398991700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398991700 is an abundant number, since it is smaller than the sum of its proper divisors (1636820506).

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

1398991700 is a wasteful number, since it uses less digits than its factorization.

1398991700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13989931 (or 13989924 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 1398991700 is about 37403.0974653170. The cubic root of 1398991700 is about 1118.4203123283.

The spelling of 1398991700 in words is "one billion, three hundred ninety-eight million, nine hundred ninety-one thousand, seven hundred".