31145418 has 32 divisors (see below), whose sum is σ = 70056000. Its totient is φ = 10255248.

The previous prime is 31145383. The next prime is 31145423. The reversal of 31145418 is 81454113.

It is a happy number.

31145418 is a `hidden beast` number, since 3 + 114 + 541 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 31145391 and 31145400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1008 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (2189250).

Almost surely, 2^31145418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31145418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35028000).

31145418 is an abundant number, since it is smaller than the sum of its proper divisors (38910582).

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

31145418 is a wasteful number, since it uses less digits than its factorization.

31145418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043 (or 7037 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 31145418 is about 5580.8080060149. The cubic root of 31145418 is about 314.6284962697.

The spelling of 31145418 in words is "thirty-one million, one hundred forty-five thousand, four hundred eighteen".