1212001040 has 20 divisors (see below), whose sum is σ = 2817902604. Its totient is φ = 484800384.

The previous prime is 1212001039. The next prime is 1212001121. The reversal of 1212001040 is 401002121.

It can be written as a sum of positive squares in 2 ways, for example, as 895445776 + 316555264 = 29924^2 + 17792^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×1212001040³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7574927 + ... + 7575086.

Almost surely, 2^1212001040 is an apocalyptic number.

1212001040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212001040 is an abundant number, since it is smaller than the sum of its proper divisors (1605901564).

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

1212001040 is a wasteful number, since it uses less digits than its factorization.

1212001040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15150026 (or 15150020 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1212001040 is about 34813.8053076649. The cubic root of 1212001040 is about 1066.1893272183.

Adding to 1212001040 its reverse (401002121), we get a palindrome (1613003161).

The spelling of 1212001040 in words is "one billion, two hundred twelve million, one thousand, forty".