31425030 has 128 divisors (see below), whose sum is σ = 103219200. Its totient is φ = 6625152.

The previous prime is 31425029. The next prime is 31425047. The reversal of 31425030 is 3052413.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31424994 and 31425012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23931 + ... + 25209.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^31425030 is an apocalyptic number.

31425030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31425030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51609600).

31425030 is an abundant number, since it is smaller than the sum of its proper divisors (71794170).

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

31425030 is a wasteful number, since it uses less digits than its factorization.

31425030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 31425030 is about 5605.8032430687. The cubic root of 31425030 is about 315.5672319201.

Adding to 31425030 its reverse (3052413), we get a palindrome (34477443).

The spelling of 31425030 in words is "thirty-one million, four hundred twenty-five thousand, thirty".