155438290 has 48 divisors (see below), whose sum is σ = 327807000. Its totient is φ = 52910592.

The previous prime is 155438287. The next prime is 155438291. The reversal of 155438290 is 92834551.

It can be written as a sum of positive squares in 4 ways, for example, as 73770921 + 81667369 = 8589^2 + 9037^2 .

It is a super-2 number, since 2×155438290² = 48322123996248200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155438291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71946 + ... + 74074.

Almost surely, 2^155438290 is an apocalyptic number.

155438290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155438290 is an abundant number, since it is smaller than the sum of its proper divisors (172368710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155438290 is a wasteful number, since it uses less digits than its factorization.

155438290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299 (or 2292 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 155438290 is about 12467.4893222332. The cubic root of 155438290 is about 537.6743721255.

The spelling of 155438290 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, two hundred ninety".