1398644490 has 32 divisors (see below), whose sum is σ = 3502694016. Its totient is φ = 356755520.

The previous prime is 1398644479. The next prime is 1398644543. The reversal of 1398644490 is 944468931.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012821 + ... + 1014200.

It is an arithmetic number, because the mean of its divisors is an integer number (109459188).

Almost surely, 2^1398644490 is an apocalyptic number.

1398644490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1398644490 is an abundant number, since it is smaller than the sum of its proper divisors (2104049526).

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

1398644490 is a wasteful number, since it uses less digits than its factorization.

1398644490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027054.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 1398644490 is about 37398.4557167806. The cubic root of 1398644490 is about 1118.3277792926.

The spelling of 1398644490 in words is "one billion, three hundred ninety-eight million, six hundred forty-four thousand, four hundred ninety".