145731394 has 8 divisors (see below), whose sum is σ = 219861180. Its totient is φ = 72444336.

The previous prime is 145731373. The next prime is 145731407. The reversal of 145731394 is 493137541.

It can be written as a sum of positive squares in 2 ways, for example, as 113955625 + 31775769 = 10675^2 + 5637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210249 + ... + 210940.

Almost surely, 2^145731394 is an apocalyptic number.

145731394 is a deficient number, since it is larger than the sum of its proper divisors (74129786).

145731394 is a wasteful number, since it uses less digits than its factorization.

145731394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421364.

The product of its digits is 45360, while the sum is 37.

The square root of 145731394 is about 12071.9258612700. The cubic root of 145731394 is about 526.2406263623.

The spelling of 145731394 in words is "one hundred forty-five million, seven hundred thirty-one thousand, three hundred ninety-four".