281389542 has 64 divisors (see below), whose sum is σ = 703033344. Its totient is φ = 73221120.

The previous prime is 281389499. The next prime is 281389583. The reversal of 281389542 is 245983182.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 281389494 and 281389503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15778 + ... + 28490.

It is an arithmetic number, because the mean of its divisors is an integer number (10984896).

Almost surely, 2^281389542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281389542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (351516672).

281389542 is an abundant number, since it is smaller than the sum of its proper divisors (421643802).

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

281389542 is a wasteful number, since it uses less digits than its factorization.

281389542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12773.

The product of its digits is 138240, while the sum is 42.

The square root of 281389542 is about 16774.6696539753. The cubic root of 281389542 is about 655.2936872281.

The spelling of 281389542 in words is "two hundred eighty-one million, three hundred eighty-nine thousand, five hundred forty-two".