40498981 has 8 divisors (see below), whose sum is σ = 43196760. Its totient is φ = 37836288.

The previous prime is 40498973. The next prime is 40498987. The reversal of 40498981 is 18989404.

40498981 = 866² + 867² + ... + 916².

It can be written as a sum of positive squares in 4 ways, for example, as 14945956 + 25553025 = 3866^2 + 5055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40498981 - 2³ = 40498973 is a prime.

It is a super-2 number, since 2×40498981² = 3280334924076722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40498987) 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, 6366 + ... + 11023.

It is an arithmetic number, because the mean of its divisors is an integer number (5399595).

Almost surely, 2^40498981 is an apocalyptic number.

It is an amenable number.

40498981 is a deficient number, since it is larger than the sum of its proper divisors (2697779).

40498981 is a wasteful number, since it uses less digits than its factorization.

40498981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17543.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 40498981 is about 6363.8809699742. The cubic root of 40498981 is about 343.4113925843.

The spelling of 40498981 in words is "forty million, four hundred ninety-eight thousand, nine hundred eighty-one".