155203640 has 16 divisors (see below), whose sum is σ = 349208280. Its totient is φ = 62081440.

The previous prime is 155203613. The next prime is 155203649. The reversal of 155203640 is 46302551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155203649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1940006 + ... + 1940085.

Almost surely, 2^155203640 is an apocalyptic number.

155203640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155203640 is an abundant number, since it is smaller than the sum of its proper divisors (194004640).

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

155203640 is a wasteful number, since it uses less digits than its factorization.

155203640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880102 (or 3880098 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 155203640 is about 12458.0752927569. The cubic root of 155203640 is about 537.4036777099.

The spelling of 155203640 in words is "one hundred fifty-five million, two hundred three thousand, six hundred forty".