42991092 has 36 divisors (see below), whose sum is σ = 110459076. Its totient is φ = 14094720.

The previous prime is 42991061. The next prime is 42991093. The reversal of 42991092 is 29019924.

It can be written as a sum of positive squares in 2 ways, for example, as 20466576 + 22524516 = 4524^2 + 4746^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42991093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7593 + ... + 11984.

Almost surely, 2^42991092 is an apocalyptic number.

It is an amenable number.

42991092 is an abundant number, since it is smaller than the sum of its proper divisors (67467984).

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

42991092 is a wasteful number, since it uses less digits than its factorization.

42991092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19648 (or 19643 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 42991092 is about 6556.7592604884. The cubic root of 42991092 is about 350.3156119106.

The spelling of 42991092 in words is "forty-two million, nine hundred ninety-one thousand, ninety-two".