1405425121 has 3 divisors (see below), whose sum is σ = 1405462611. Its totient is φ = 1405387632.

The previous prime is 1405425103. The next prime is 1405425157. The reversal of 1405425121 is 1215245041.

The square root of 1405425121 is 37489.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1313265121 + 92160000 = 36239^2 + 9600^2 .

It is not a de Polignac number, because 1405425121 - 2¹⁵ = 1405392353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1405429121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18745 + ... + 56233.

It is an arithmetic number, because the mean of its divisors is an integer number (468487537).

Almost surely, 2^1405425121 is an apocalyptic number.

1405425121 is the 37489-th square number.

1405425121 is the 18745-th centered octagonal number.

It is an amenable number.

1405425121 is a deficient number, since it is larger than the sum of its proper divisors (37490).

1405425121 is an frugal number, since it uses more digits than its factorization.

1405425121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74978 (or 37489 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The cubic root of 1405425121 is about 1120.1320850281.

Multiplying 1405425121 by its sum of digits (25), we get a square (35135628025 = 187445²).

Multiplying 1405425121 by its product of nonzero digits (1600), we get a square (2248680193600 = 1499560²).

The spelling of 1405425121 in words is "one billion, four hundred five million, four hundred twenty-five thousand, one hundred twenty-one".