155970 has 24 divisors (see below), whose sum is σ = 405756. Its totient is φ = 41568.
The previous prime is 155921. The next prime is 156007. The reversal of 155970 is 79551.
It can be written as a sum of positive squares in 2 ways, for example, as 154449 + 1521 = 393^2 + 39^2 .
It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155970.
It is an unprimeable number.
155970 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 in 11 ways as a sum of consecutive naturals, for example, 777 + ... + 956.
2155970 is an apocalyptic number.
155970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
155970 is an abundant number, since it is smaller than the sum of its proper divisors (249786).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
155970 is a wasteful number, since it uses less digits than its factorization.
155970 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1746 (or 1743 counting only the distinct ones).
The product of its (nonzero) digits is 1575, while the sum is 27.
The square root of 155970 is about 394.9303736103. The cubic root of 155970 is about 53.8286751223.
The spelling of 155970 in words is "one hundred fifty-five thousand, nine hundred seventy".
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