398121465 has 32 divisors (see below), whose sum is σ = 735517440. Its totient is φ = 180117504.

The previous prime is 398121463. The next prime is 398121473. The reversal of 398121465 is 564121893.

It is not a de Polignac number, because 398121465 - 2¹ = 398121463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398121461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9360 + ... + 29729.

It is an arithmetic number, because the mean of its divisors is an integer number (22984920).

Almost surely, 2^398121465 is an apocalyptic number.

398121465 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

398121465 is a deficient number, since it is larger than the sum of its proper divisors (337395975).

398121465 is a wasteful number, since it uses less digits than its factorization.

398121465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39201.

The product of its digits is 51840, while the sum is 39.

The square root of 398121465 is about 19952.9813561783. The cubic root of 398121465 is about 735.6510590176.

The spelling of 398121465 in words is "three hundred ninety-eight million, one hundred twenty-one thousand, four hundred sixty-five".