155227994 has 4 divisors (see below), whose sum is σ = 232841994. Its totient is φ = 77613996.

The previous prime is 155227993. The next prime is 155227999. The reversal of 155227994 is 499722551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 96138025 + 59089969 = 9805^2 + 7687^2 .

It is not an unprimeable number, because it can be changed into a prime (155227993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38806997 + ... + 38807000.

Almost surely, 2^155227994 is an apocalyptic number.

155227994 is a deficient number, since it is larger than the sum of its proper divisors (77614000).

155227994 is an equidigital number, since it uses as much as digits as its factorization.

155227994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77613999.

The product of its digits is 226800, while the sum is 44.

The square root of 155227994 is about 12459.0526927211. The cubic root of 155227994 is about 537.4317853940.

The spelling of 155227994 in words is "one hundred fifty-five million, two hundred twenty-seven thousand, nine hundred ninety-four".