155345440 has 24 divisors (see below), whose sum is σ = 367003980. Its totient is φ = 62138112.

The previous prime is 155345429. The next prime is 155345447. The reversal of 155345440 is 44543551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127509264 + 27836176 = 11292^2 + 5276^2 .

It is not an unprimeable number, because it can be changed into a prime (155345447) 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, 485295 + ... + 485614.

Almost surely, 2^155345440 is an apocalyptic number.

155345440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155345440 is an abundant number, since it is smaller than the sum of its proper divisors (211658540).

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

155345440 is an equidigital number, since it uses as much as digits as its factorization.

155345440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970924 (or 970916 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 155345440 is about 12463.7650812265. The cubic root of 155345440 is about 537.5672920978.

Adding to 155345440 its reverse (44543551), we get a palindrome (199888991).

The spelling of 155345440 in words is "one hundred fifty-five million, three hundred forty-five thousand, four hundred forty".