11397978 has 12 divisors (see below), whose sum is σ = 24695658. Its totient is φ = 3799320.

The previous prime is 11397977. The next prime is 11397979. The reversal of 11397978 is 87979311.

It is an interprime number because it is at equal distance from previous prime (11397977) and next prime (11397979).

It can be written as a sum of positive squares in only one way, i.e., 11309769 + 88209 = 3363^2 + 297^2 .

It is not an unprimeable number, because it can be changed into a prime (11397977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316593 + ... + 316628.

Almost surely, 2^11397978 is an apocalyptic number.

11397978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11397978 is an abundant number, since it is smaller than the sum of its proper divisors (13297680).

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

11397978 is a wasteful number, since it uses less digits than its factorization.

11397978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633229 (or 633226 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 11397978 is about 3376.0891575905. The cubic root of 11397978 is about 225.0484044008.

The spelling of 11397978 in words is "eleven million, three hundred ninety-seven thousand, nine hundred seventy-eight".