391098240 has 256 divisors, whose sum is σ = 1492545600. Its totient is φ = 96215040.

The previous prime is 391098203. The next prime is 391098247. The reversal of 391098240 is 42890193.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 391098195 and 391098204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391098247) 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, 223770 + ... + 225510.

Almost surely, 2^391098240 is an apocalyptic number.

391098240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391098240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746272800).

391098240 is an abundant number, since it is smaller than the sum of its proper divisors (1101447360).

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

391098240 is a wasteful number, since it uses less digits than its factorization.

391098240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 391098240 is about 19776.2038824442. The cubic root of 391098240 is about 731.2995180142.

The spelling of 391098240 in words is "three hundred ninety-one million, ninety-eight thousand, two hundred forty".