155420340 has 48 divisors (see below), whose sum is σ = 445798080. Its totient is φ = 40433920.

The previous prime is 155420333. The next prime is 155420357. The reversal of 155420340 is 43024551.

It is a self number, because there is not a number n which added to its sum of digits gives 155420340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29130 + ... + 34049.

It is an arithmetic number, because the mean of its divisors is an integer number (9287460).

Almost surely, 2^155420340 is an apocalyptic number.

155420340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155420340 is an abundant number, since it is smaller than the sum of its proper divisors (290377740).

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

155420340 is a wasteful number, since it uses less digits than its factorization.

155420340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63232 (or 63230 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 155420340 is about 12466.7694291665. The cubic root of 155420340 is about 537.6536744657.

Adding to 155420340 its reverse (43024551), we get a palindrome (198444891).

The spelling of 155420340 in words is "one hundred fifty-five million, four hundred twenty thousand, three hundred forty".