1398262639 has 8 divisors (see below), whose sum is σ = 1408376880. Its totient is φ = 1388172096.

The previous prime is 1398262609. The next prime is 1398262681. The reversal of 1398262639 is 9362628931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1398262639 - 2¹⁵ = 1398229871 is a prime.

It is a super-5 number, since 5×1398262639⁵ (a number of 47 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1398262592 and 1398262601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398262609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122379 + ... + 133315.

It is an arithmetic number, because the mean of its divisors is an integer number (176047110).

Almost surely, 2^1398262639 is an apocalyptic number.

1398262639 is a deficient number, since it is larger than the sum of its proper divisors (10114241).

1398262639 is a wasteful number, since it uses less digits than its factorization.

1398262639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11849.

The product of its digits is 839808, while the sum is 49.

The square root of 1398262639 is about 37393.3501975953. The cubic root of 1398262639 is about 1118.2259965899.

The spelling of 1398262639 in words is "one billion, three hundred ninety-eight million, two hundred sixty-two thousand, six hundred thirty-nine".