145640240 has 40 divisors (see below), whose sum is σ = 340009488. Its totient is φ = 58016000.

The previous prime is 145640239. The next prime is 145640267. The reversal of 145640240 is 42046541.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×145640240² = 42422159014515200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16454 + ... + 23706.

Almost surely, 2^145640240 is an apocalyptic number.

145640240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145640240 is an abundant number, since it is smaller than the sum of its proper divisors (194369248).

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

145640240 is a wasteful number, since it uses less digits than its factorization.

145640240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7517 (or 7511 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 145640240 is about 12068.1498167698. The cubic root of 145640240 is about 526.1308834953.

Adding to 145640240 its reverse (42046541), we get a palindrome (187686781).

The spelling of 145640240 in words is "one hundred forty-five million, six hundred forty thousand, two hundred forty".