1235161978 has 16 divisors (see below), whose sum is σ = 1861364736. Its totient is φ = 614714400.

The previous prime is 1235161973. The next prime is 1235161987. The reversal of 1235161978 is 8791615321.

It is a super-2 number, since 2×1235161978² = 3051250223793744968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1235161973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459025 + ... + 461707.

It is an arithmetic number, because the mean of its divisors is an integer number (116335296).

Almost surely, 2^1235161978 is an apocalyptic number.

1235161978 is a deficient number, since it is larger than the sum of its proper divisors (626202758).

1235161978 is a wasteful number, since it uses less digits than its factorization.

1235161978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669.

The product of its digits is 90720, while the sum is 43.

The square root of 1235161978 is about 35144.8712901328. The cubic root of 1235161978 is about 1072.9380277452.

The spelling of 1235161978 in words is "one billion, two hundred thirty-five million, one hundred sixty-one thousand, nine hundred seventy-eight".