1220123402 has 4 divisors (see below), whose sum is σ = 1830185106. Its totient is φ = 610061700.

The previous prime is 1220123381. The next prime is 1220123449. The reversal of 1220123402 is 2043210221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 789104281 + 431019121 = 28091^2 + 20761^2 .

It is a super-2 number, since 2×1220123402² = 2977402232216107208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305030849 + ... + 305030852.

Almost surely, 2^1220123402 is an apocalyptic number.

1220123402 is a deficient number, since it is larger than the sum of its proper divisors (610061704).

1220123402 is an equidigital number, since it uses as much as digits as its factorization.

1220123402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610061703.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1220123402 is about 34930.2648429696. The cubic root of 1220123402 is about 1068.5657559030.

Adding to 1220123402 its reverse (2043210221), we get a palindrome (3263333623).

The spelling of 1220123402 in words is "one billion, two hundred twenty million, one hundred twenty-three thousand, four hundred two".