1240643434 has 8 divisors (see below), whose sum is σ = 1873455300. Its totient is φ = 616158336.

The previous prime is 1240643429. The next prime is 1240643441. The reversal of 1240643434 is 4343460421.

It can be written as a sum of positive squares in 2 ways, for example, as 1111889025 + 128754409 = 33345^2 + 11347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1240643434² = 3078392260654624712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1240643396 and 1240643405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081319 + ... + 2081914.

Almost surely, 2^1240643434 is an apocalyptic number.

1240643434 is a deficient number, since it is larger than the sum of its proper divisors (632811866).

1240643434 is a wasteful number, since it uses less digits than its factorization.

1240643434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4163384.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 1240643434 is about 35222.7686873136. The cubic root of 1240643434 is about 1074.5228627814.

The spelling of 1240643434 in words is "one billion, two hundred forty million, six hundred forty-three thousand, four hundred thirty-four".