72974138 has 8 divisors (see below), whose sum is σ = 112419732. Its totient is φ = 35500896.

The previous prime is 72974131. The next prime is 72974141. The reversal of 72974138 is 83147927.

It can be written as a sum of positive squares in 2 ways, for example, as 70274689 + 2699449 = 8383^2 + 1643^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 72974095 and 72974104.

It is not an unprimeable number, because it can be changed into a prime (72974131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492995 + ... + 493142.

Almost surely, 2^72974138 is an apocalyptic number.

72974138 is a deficient number, since it is larger than the sum of its proper divisors (39445594).

72974138 is a wasteful number, since it uses less digits than its factorization.

72974138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986176.

The product of its digits is 84672, while the sum is 41.

The square root of 72974138 is about 8542.4901521746. The cubic root of 72974138 is about 417.8845594387.

The spelling of 72974138 in words is "seventy-two million, nine hundred seventy-four thousand, one hundred thirty-eight".