155747138 has 16 divisors (see below), whose sum is σ = 239181120. Its totient is φ = 76038000.

The previous prime is 155747101. The next prime is 155747147. The reversal of 155747138 is 831747551.

It is a happy number.

It is a super-3 number, since 3×155747138³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155747095 and 155747104.

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, 13448 + ... + 22188.

It is an arithmetic number, because the mean of its divisors is an integer number (14948820).

Almost surely, 2^155747138 is an apocalyptic number.

155747138 is a deficient number, since it is larger than the sum of its proper divisors (83433982).

155747138 is a wasteful number, since it uses less digits than its factorization.

155747138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8953.

The product of its digits is 117600, while the sum is 41.

The square root of 155747138 is about 12479.8693102131. The cubic root of 155747138 is about 538.0302470983.

The spelling of 155747138 in words is "one hundred fifty-five million, seven hundred forty-seven thousand, one hundred thirty-eight".