698487138 has 40 divisors (see below), whose sum is σ = 1633186368. Its totient is φ = 222704856.

The previous prime is 698487131. The next prime is 698487169. The reversal of 698487138 is 831784896.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (698487131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 90006 + ... + 97457.

Almost surely, 2^698487138 is an apocalyptic number.

698487138 is an abundant number, since it is smaller than the sum of its proper divisors (934699230).

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

698487138 is a wasteful number, since it uses less digits than its factorization.

698487138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187500 (or 187491 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 698487138 is about 26428.9072418819. The cubic root of 698487138 is about 887.2638850294.

The spelling of 698487138 in words is "six hundred ninety-eight million, four hundred eighty-seven thousand, one hundred thirty-eight".