1223401861 has 16 divisors (see below), whose sum is σ = 1346623488. Its totient is φ = 1102230000.

The previous prime is 1223401853. The next prime is 1223401867. The reversal of 1223401861 is 1681043221.

It is a cyclic number.

It is not a de Polignac number, because 1223401861 - 2³ = 1223401853 is a prime.

It is a super-2 number, since 2×1223401861² = 2993424226996526642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223401867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 614710 + ... + 616696.

It is an arithmetic number, because the mean of its divisors is an integer number (84163968).

Almost surely, 2^1223401861 is an apocalyptic number.

1223401861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1223401861 is a deficient number, since it is larger than the sum of its proper divisors (123221627).

1223401861 is a wasteful number, since it uses less digits than its factorization.

1223401861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1223401861 is about 34977.1619917912. The cubic root of 1223401861 is about 1069.5219750193.

The spelling of 1223401861 in words is "one billion, two hundred twenty-three million, four hundred one thousand, eight hundred sixty-one".