145231240 has 128 divisors (see below), whose sum is σ = 414616320. Its totient is φ = 44467200.

The previous prime is 145231211. The next prime is 145231241. The reversal of 145231240 is 42132541.

It is a super-2 number, since 2×145231240² = 42184226143875200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (145231241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187494 + ... + 188266.

It is an arithmetic number, because the mean of its divisors is an integer number (3239190).

Almost surely, 2^145231240 is an apocalyptic number.

145231240 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 145231240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207308160).

145231240 is an abundant number, since it is smaller than the sum of its proper divisors (269385080).

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

145231240 is a wasteful number, since it uses less digits than its factorization.

145231240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 145231240 is about 12051.1924721166. The cubic root of 145231240 is about 525.6379124077.

Adding to 145231240 its reverse (42132541), we get a palindrome (187363781).

The spelling of 145231240 in words is "one hundred forty-five million, two hundred thirty-one thousand, two hundred forty".