398261493 has 12 divisors (see below), whose sum is σ = 657447648. Its totient is φ = 227577960.

The previous prime is 398261477. The next prime is 398261509. The reversal of 398261493 is 394162893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (398261477) and next prime (398261509).

It is not a de Polignac number, because 398261493 - 2⁴ = 398261477 is a prime.

It is a super-2 number, since 2×398261493² = 317224433613178098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398261453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3160743 + ... + 3160868.

It is an arithmetic number, because the mean of its divisors is an integer number (54787304).

Almost surely, 2^398261493 is an apocalyptic number.

It is an amenable number.

398261493 is a deficient number, since it is larger than the sum of its proper divisors (259186155).

398261493 is a wasteful number, since it uses less digits than its factorization.

398261493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6321624 (or 6321621 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 398261493 is about 19956.4899969910. The cubic root of 398261493 is about 735.7372970804.

The spelling of 398261493 in words is "three hundred ninety-eight million, two hundred sixty-one thousand, four hundred ninety-three".