1405121550 has 72 divisors (see below), whose sum is σ = 4053653496. Its totient is φ = 321168960.

The previous prime is 1405121513. The next prime is 1405121561. The reversal of 1405121550 is 551215041.

It is a self number, because there is not a number n which added to its sum of digits gives 1405121550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 88237 + ... + 102936.

It is an arithmetic number, because the mean of its divisors is an integer number (56300743).

Almost surely, 2^1405121550 is an apocalyptic number.

1405121550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1405121550 is an abundant number, since it is smaller than the sum of its proper divisors (2648531946).

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

1405121550 is a wasteful number, since it uses less digits than its factorization.

1405121550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191202 (or 191190 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 1405121550 is about 37484.9509803601. The cubic root of 1405121550 is about 1120.0514299300.

Adding to 1405121550 its reverse (551215041), we get a palindrome (1956336591).

The spelling of 1405121550 in words is "one billion, four hundred five million, one hundred twenty-one thousand, five hundred fifty".