1552400225 has 12 divisors (see below), whose sum is σ = 2026291440. Its totient is φ = 1176555600.

The previous prime is 1552400221. The next prime is 1552400279. The reversal of 1552400225 is 5220042551.

It is not a de Polignac number, because 1552400225 - 2² = 1552400221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1552400194 and 1552400203.

It is not an unprimeable number, because it can be changed into a prime (1552400221) 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, 1633631 + ... + 1634580.

It is an arithmetic number, because the mean of its divisors is an integer number (168857620).

Almost surely, 2^1552400225 is an apocalyptic number.

It is an amenable number.

1552400225 is a deficient number, since it is larger than the sum of its proper divisors (473891215).

1552400225 is a wasteful number, since it uses less digits than its factorization.

1552400225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268240 (or 3268235 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 1552400225 is about 39400.5104662363. The cubic root of 1552400225 is about 1157.8915884819.

Adding to 1552400225 its reverse (5220042551), we get a palindrome (6772442776).

The spelling of 1552400225 in words is "one billion, five hundred fifty-two million, four hundred thousand, two hundred twenty-five".