155115400 has 48 divisors (see below), whose sum is σ = 393434640. Its totient is φ = 56404800.

The previous prime is 155115379. The next prime is 155115409. The reversal of 155115400 is 4511551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (155115409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33054 + ... + 37453.

It is an arithmetic number, because the mean of its divisors is an integer number (8196555).

Almost surely, 2^155115400 is an apocalyptic number.

155115400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155115400 is an abundant number, since it is smaller than the sum of its proper divisors (238319240).

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

155115400 is a wasteful number, since it uses less digits than its factorization.

155115400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70534 (or 70525 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 155115400 is about 12454.5333112084. The cubic root of 155115400 is about 537.3018126372.

Adding to 155115400 its reverse (4511551), we get a palindrome (159626951).

The spelling of 155115400 in words is "one hundred fifty-five million, one hundred fifteen thousand, four hundred".