1211953642 has 8 divisors (see below), whose sum is σ = 1822885056. Its totient is φ = 604325292.

The previous prime is 1211953621. The next prime is 1211953643. The reversal of 1211953642 is 2463591121.

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

It is a junction number, because it is equal to n+sod(n) for n = 1211953598 and 1211953607.

It is not an unprimeable number, because it can be changed into a prime (1211953643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824848 + ... + 826315.

It is an arithmetic number, because the mean of its divisors is an integer number (227860632).

Almost surely, 2^1211953642 is an apocalyptic number.

1211953642 is a deficient number, since it is larger than the sum of its proper divisors (610931414).

1211953642 is a wasteful number, since it uses less digits than its factorization.

1211953642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651532.

The product of its digits is 12960, while the sum is 34.

The square root of 1211953642 is about 34813.1245653130. The cubic root of 1211953642 is about 1066.1754284677.

The spelling of 1211953642 in words is "one billion, two hundred eleven million, nine hundred fifty-three thousand, six hundred forty-two".