145247274 has 36 divisors (see below), whose sum is σ = 323901474. Its totient is φ = 47006352.

The previous prime is 145247243. The next prime is 145247279. The reversal of 145247274 is 472742541.

145247274 is a `hidden beast` number, since 145 + 247 + 274 = 666.

It can be written as a sum of positive squares in only one way, i.e., 96177249 + 49070025 = 9807^2 + 7005^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145247279) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 310789 + ... + 311255.

Almost surely, 2^145247274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145247274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161950737).

145247274 is an abundant number, since it is smaller than the sum of its proper divisors (178654200).

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

145247274 is an equidigital number, since it uses as much as digits as its factorization.

145247274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 509 counting only the distinct ones).

The product of its digits is 62720, while the sum is 36.

The square root of 145247274 is about 12051.8576991267. The cubic root of 145247274 is about 525.6572557394.

The spelling of 145247274 in words is "one hundred forty-five million, two hundred forty-seven thousand, two hundred seventy-four".