1225400535 has 32 divisors (see below), whose sum is σ = 2293152000. Its totient is φ = 619148448.

The previous prime is 1225400507. The next prime is 1225400549. The reversal of 1225400535 is 5350045221.

It is a happy number.

1225400535 is a `hidden beast` number, since 1 + 225 + 400 + 5 + 35 = 666.

It is not a de Polignac number, because 1225400535 - 2¹² = 1225396439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1225400499 and 1225400508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236305 + ... + 241434.

It is an arithmetic number, because the mean of its divisors is an integer number (71661000).

Almost surely, 2^1225400535 is an apocalyptic number.

1225400535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1225400535 is a deficient number, since it is larger than the sum of its proper divisors (1067751465).

1225400535 is a wasteful number, since it uses less digits than its factorization.

1225400535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477772 (or 477766 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1225400535 is about 35005.7214609269. The cubic root of 1225400535 is about 1070.1040848467.

Adding to 1225400535 its reverse (5350045221), we get a palindrome (6575445756).

The spelling of 1225400535 in words is "one billion, two hundred twenty-five million, four hundred thousand, five hundred thirty-five".