155235440 has 20 divisors (see below), whose sum is σ = 360922584. Its totient is φ = 62094144.

The previous prime is 155235439. The next prime is 155235467. The reversal of 155235440 is 44532551.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970142 + ... + 970301.

Almost surely, 2^155235440 is an apocalyptic number.

155235440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155235440 is an abundant number, since it is smaller than the sum of its proper divisors (205687144).

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

155235440 is a wasteful number, since it uses less digits than its factorization.

155235440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940456 (or 1940450 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 155235440 is about 12459.3515080039. The cubic root of 155235440 is about 537.4403784598.

Adding to 155235440 its reverse (44532551), we get a palindrome (199767991).

The spelling of 155235440 in words is "one hundred fifty-five million, two hundred thirty-five thousand, four hundred forty".