155290 has 16 divisors (see below), whose sum is σ = 285768. Its totient is φ = 60736.

The previous prime is 155269. The next prime is 155291. The reversal of 155290 is 92551.

It can be written as a sum of positive squares in 4 ways, for example, as 154449 + 841 = 393^2 + 29^2 .

It is a super-2 number, since 2×155290² = 48229968200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384 + ... + 676.

2¹⁵⁵²⁹⁰ is an apocalyptic number.

155290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155290 is a deficient number, since it is larger than the sum of its proper divisors (130478).

155290 is a wasteful number, since it uses less digits than its factorization.

155290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 155290 is about 394.0685219603. The cubic root of 155290 is about 53.7503335115.

The spelling of 155290 in words is "one hundred fifty-five thousand, two hundred ninety".