40993890 has 96 divisors (see below), whose sum is σ = 116225280. Its totient is φ = 9225216.

The previous prime is 40993879. The next prime is 40993903. The reversal of 40993890 is 9839904.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115954 + ... + 116306.

It is an arithmetic number, because the mean of its divisors is an integer number (1210680).

Almost surely, 2^40993890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40993890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58112640).

40993890 is an abundant number, since it is smaller than the sum of its proper divisors (75231390).

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

40993890 is a wasteful number, since it uses less digits than its factorization.

40993890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 40993890 is about 6402.6471088137. The cubic root of 40993890 is about 344.8045942383.

The spelling of 40993890 in words is "forty million, nine hundred ninety-three thousand, eight hundred ninety".