155698 has 4 divisors (see below), whose sum is σ = 233550. Its totient is φ = 77848.

The previous prime is 155693. The next prime is 155699. The reversal of 155698 is 896551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 896551 = 31 ⋅28921.

It can be written as a sum of positive squares in only one way, i.e., 149769 + 5929 = 387^2 + 77^2 .

It is not an unprimeable number, because it can be changed into a prime (155693) by changing a digit.

155698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38923 + ... + 38926.

2¹⁵⁵⁶⁹⁸ is an apocalyptic number.

155698 is a deficient number, since it is larger than the sum of its proper divisors (77852).

155698 is an equidigital number, since it uses as much as digits as its factorization.

155698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77851.

The product of its digits is 10800, while the sum is 34.

The square root of 155698 is about 394.5858588444. The cubic root of 155698 is about 53.7973658555.

The spelling of 155698 in words is "one hundred fifty-five thousand, six hundred ninety-eight".