1531299420 has 144 divisors (see below), whose sum is σ = 5318808768. Its totient is φ = 349332480.

The previous prime is 1531299403. The next prime is 1531299421. The reversal of 1531299420 is 249921351.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531299421) 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, 958062 + ... + 959658.

It is an arithmetic number, because the mean of its divisors is an integer number (36936172).

Almost surely, 2^1531299420 is an apocalyptic number.

1531299420 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 1531299420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2659404384).

1531299420 is an abundant number, since it is smaller than the sum of its proper divisors (3787509348).

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

1531299420 is a wasteful number, since it uses less digits than its factorization.

1531299420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380 (or 2375 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1531299420 is about 39131.8210667482. The cubic root of 1531299420 is about 1152.6214727594.

The spelling of 1531299420 in words is "one billion, five hundred thirty-one million, two hundred ninety-nine thousand, four hundred twenty".