1398517491 has 32 divisors (see below), whose sum is σ = 2148664320. Its totient is φ = 792589824.

The previous prime is 1398517469. The next prime is 1398517501. The reversal of 1398517491 is 1947158931.

It is not a de Polignac number, because 1398517491 - 2¹⁷ = 1398386419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1398517491.

It is not an unprimeable number, because it can be changed into a prime (1398517441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1728295 + ... + 1729103.

It is an arithmetic number, because the mean of its divisors is an integer number (67145760).

Almost surely, 2^1398517491 is an apocalyptic number.

1398517491 is a deficient number, since it is larger than the sum of its proper divisors (750146829).

1398517491 is a wasteful number, since it uses less digits than its factorization.

1398517491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395.

The product of its digits is 272160, while the sum is 48.

The square root of 1398517491 is about 37396.7577605332. The cubic root of 1398517491 is about 1118.2939296594.

The spelling of 1398517491 in words is "one billion, three hundred ninety-eight million, five hundred seventeen thousand, four hundred ninety-one".