1221662862 has 24 divisors (see below), whose sum is σ = 3025070256. Its totient is φ = 349046496.

The previous prime is 1221662833. The next prime is 1221662951. The reversal of 1221662862 is 2682661221.

It is a happy number.

1221662862 is a `hidden beast` number, since 1 + 2 + 21 + 6 + 628 + 6 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4847743 + ... + 4847994.

It is an arithmetic number, because the mean of its divisors is an integer number (126044594).

Almost surely, 2^1221662862 is an apocalyptic number.

1221662862 is an abundant number, since it is smaller than the sum of its proper divisors (1803407394).

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

1221662862 is a wasteful number, since it uses less digits than its factorization.

1221662862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695752 (or 9695749 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1221662862 is about 34952.2940877992. The cubic root of 1221662862 is about 1069.0149790086.

It can be divided in two parts, 12216 and 62862, that added together give a triangular number (75078 = T₃₈₇).

The spelling of 1221662862 in words is "one billion, two hundred twenty-one million, six hundred sixty-two thousand, eight hundred sixty-two".