98040721 has 4 divisors (see below), whose sum is σ = 98908452. Its totient is φ = 97172992.

The previous prime is 98040689. The next prime is 98040727. The reversal of 98040721 is 12704089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37761025 + 60279696 = 6145^2 + 7764^2 .

It is a cyclic number.

It is not a de Polignac number, because 98040721 - 2⁵ = 98040689 is a prime.

It is a super-2 number, since 2×98040721² = 19223965948399682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98040727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433696 + ... + 433921.

It is an arithmetic number, because the mean of its divisors is an integer number (24727113).

Almost surely, 2^98040721 is an apocalyptic number.

It is an amenable number.

98040721 is a deficient number, since it is larger than the sum of its proper divisors (867731).

98040721 is a wasteful number, since it uses less digits than its factorization.

98040721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867730.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 98040721 is about 9901.5514440920. The cubic root of 98040721 is about 461.1074780422.

The spelling of 98040721 in words is "ninety-eight million, forty thousand, seven hundred twenty-one".