11801690 has 16 divisors (see below), whose sum is σ = 21381192. Its totient is φ = 4689984.

The previous prime is 11801663. The next prime is 11801693. The reversal of 11801690 is 9610811.

It can be written as a sum of positive squares in 4 ways, for example, as 10738729 + 1062961 = 3277^2 + 1031^2 .

It is a super-2 number, since 2×11801690² = 278559773712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11801693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2189 + ... + 5328.

Almost surely, 2^11801690 is an apocalyptic number.

11801690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11801690 is a deficient number, since it is larger than the sum of its proper divisors (9579502).

11801690 is a wasteful number, since it uses less digits than its factorization.

11801690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7681.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 11801690 is about 3435.3587876669. The cubic root of 11801690 is about 227.6746796735.

The spelling of 11801690 in words is "eleven million, eight hundred one thousand, six hundred ninety".