998687431 has 8 divisors (see below), whose sum is σ = 1141706240. Its totient is φ = 855755928.

The previous prime is 998687419. The next prime is 998687449. The reversal of 998687431 is 134786899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998687431 - 2¹⁵ = 998654663 is a prime.

It is a super-2 number, since 2×998687431² = 1994753169674759522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998687411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4870 + ... + 44956.

It is an arithmetic number, because the mean of its divisors is an integer number (142713280).

Almost surely, 2^998687431 is an apocalyptic number.

998687431 is a deficient number, since it is larger than the sum of its proper divisors (143018809).

998687431 is a wasteful number, since it uses less digits than its factorization.

998687431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43653.

The product of its digits is 2612736, while the sum is 55.

The square root of 998687431 is about 31602.0162489674. The cubic root of 998687431 is about 999.5622854339.

The spelling of 998687431 in words is "nine hundred ninety-eight million, six hundred eighty-seven thousand, four hundred thirty-one".