1225979958 has 64 divisors (see below), whose sum is σ = 2852739072. Its totient is φ = 344010240.

The previous prime is 1225979957. The next prime is 1225979981. The reversal of 1225979958 is 8599795221.

It is a junction number, because it is equal to n+sod(n) for n = 1225979898 and 1225979907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225979957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 860835 + ... + 862257.

It is an arithmetic number, because the mean of its divisors is an integer number (44574048).

Almost surely, 2^1225979958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225979958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426369536).

1225979958 is an abundant number, since it is smaller than the sum of its proper divisors (1626759114).

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

1225979958 is a wasteful number, since it uses less digits than its factorization.

1225979958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789.

The product of its digits is 4082400, while the sum is 57.

The square root of 1225979958 is about 35013.9966013593. The cubic root of 1225979958 is about 1070.2727222838.

The spelling of 1225979958 in words is "one billion, two hundred twenty-five million, nine hundred seventy-nine thousand, nine hundred fifty-eight".