40170690 has 72 divisors (see below), whose sum is σ = 121509180. Its totient is φ = 9180864.

The previous prime is 40170667. The next prime is 40170701. The reversal of 40170690 is 9607104.

It can be written as a sum of positive squares in 2 ways, for example, as 36832761 + 3337929 = 6069^2 + 1827^2 .

It is a super-2 number, since 2×40170690² = 3227368670152200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 145 + ... + 8964.

Almost surely, 2^40170690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40170690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60754590).

40170690 is an abundant number, since it is smaller than the sum of its proper divisors (81338490).

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

40170690 is a wasteful number, since it uses less digits than its factorization.

40170690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9136 (or 9126 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 40170690 is about 6338.0351845032. The cubic root of 40170690 is about 342.4809586800.

Adding to 40170690 its reverse (9607104), we get a palindrome (49777794).

The spelling of 40170690 in words is "forty million, one hundred seventy thousand, six hundred ninety".