398740901 has 4 divisors (see below), whose sum is σ = 429413292. Its totient is φ = 368068512.

The previous prime is 398740883. The next prime is 398740921. The reversal of 398740901 is 109047893.

It is a happy number.

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 92140801 + 306600100 = 9599^2 + 17510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398740901 is a prime.

It is a super-2 number, since 2×398740901² = 317988612260583602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398740921) 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, 15336176 + ... + 15336201.

It is an arithmetic number, because the mean of its divisors is an integer number (107353323).

Almost surely, 2^398740901 is an apocalyptic number.

It is an amenable number.

398740901 is a deficient number, since it is larger than the sum of its proper divisors (30672391).

398740901 is a wasteful number, since it uses less digits than its factorization.

398740901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30672390.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 398740901 is about 19968.4977151512. The cubic root of 398740901 is about 736.0323937430.

The spelling of 398740901 in words is "three hundred ninety-eight million, seven hundred forty thousand, nine hundred one".