1206400402 has 32 divisors (see below), whose sum is σ = 1974067200. Its totient is φ = 550832400.

The previous prime is 1206400399. The next prime is 1206400423. The reversal of 1206400402 is 2040046021.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 1206400402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317349 + ... + 321127.

It is an arithmetic number, because the mean of its divisors is an integer number (61689600).

Almost surely, 2^1206400402 is an apocalyptic number.

1206400402 is a deficient number, since it is larger than the sum of its proper divisors (767666798).

1206400402 is a wasteful number, since it uses less digits than its factorization.

1206400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1206400402 is about 34733.2751407062. The cubic root of 1206400402 is about 1064.5445096058.

Adding to 1206400402 its reverse (2040046021), we get a palindrome (3246446423).

It can be divided in two parts, 1 and 206400402, that added together give a triangular number (206400403 = T₂₀₃₁₇).

The spelling of 1206400402 in words is "one billion, two hundred six million, four hundred thousand, four hundred two".