1534398840 has 192 divisors, whose sum is σ = 5462402400. Its totient is φ = 371229696.

The previous prime is 1534398823. The next prime is 1534398841. The reversal of 1534398840 is 488934351.

1534398840 is a `hidden beast` number, since 1 + 534 + 39 + 8 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1534398841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 273342 + ... + 278898.

Almost surely, 2^1534398840 is an apocalyptic number.

1534398840 is a gapful number since it is divisible by the number (10) 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 1534398840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2731201200).

1534398840 is an abundant number, since it is smaller than the sum of its proper divisors (3928003560).

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

1534398840 is a wasteful number, since it uses less digits than its factorization.

1534398840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5646 (or 5639 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 1534398840 is about 39171.4033447871. The cubic root of 1534398840 is about 1153.3986015239.

The spelling of 1534398840 in words is "one billion, five hundred thirty-four million, three hundred ninety-eight thousand, eight hundred forty".