231388494 has 16 divisors (see below), whose sum is σ = 470364240. Its totient is φ = 75864960.

The previous prime is 231388489. The next prime is 231388499. The reversal of 231388494 is 494883132.

It is an interprime number because it is at equal distance from previous prime (231388489) and next prime (231388499).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231388499) 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, 315739 + ... + 316470.

It is an arithmetic number, because the mean of its divisors is an integer number (29397765).

Almost surely, 2^231388494 is an apocalyptic number.

231388494 is an abundant number, since it is smaller than the sum of its proper divisors (238975746).

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

231388494 is a wasteful number, since it uses less digits than its factorization.

231388494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632275.

The product of its digits is 165888, while the sum is 42.

The square root of 231388494 is about 15211.4592988313. The cubic root of 231388494 is about 613.9230222474.

The spelling of 231388494 in words is "two hundred thirty-one million, three hundred eighty-eight thousand, four hundred ninety-four".