398003731 has 4 divisors (see below), whose sum is σ = 401944464. Its totient is φ = 394063000.

The previous prime is 398003693. The next prime is 398003747. The reversal of 398003731 is 137300893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137300893 = 313 ⋅438661.

It is a cyclic number.

It is not a de Polignac number, because 398003731 - 2¹⁷ = 397872659 is a prime.

It is a super-2 number, since 2×398003731² = 316813939779840722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398003791) 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, 1970215 + ... + 1970416.

It is an arithmetic number, because the mean of its divisors is an integer number (100486116).

Almost surely, 2^398003731 is an apocalyptic number.

398003731 is a deficient number, since it is larger than the sum of its proper divisors (3940733).

398003731 is a wasteful number, since it uses less digits than its factorization.

398003731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940732.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 398003731 is about 19950.0308521065. The cubic root of 398003731 is about 735.5785353547.

The spelling of 398003731 in words is "three hundred ninety-eight million, three thousand, seven hundred thirty-one".