1391531898 has 16 divisors (see below), whose sum is σ = 2788158240. Its totient is φ = 462994896.

The previous prime is 1391531891. The next prime is 1391531903. The reversal of 1391531898 is 8981351931.

It is a super-2 number, since 2×1391531898² = 3872722046302964808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1391531891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208713 + ... + 215276.

It is an arithmetic number, because the mean of its divisors is an integer number (174259890).

Almost surely, 2^1391531898 is an apocalyptic number.

1391531898 is an abundant number, since it is smaller than the sum of its proper divisors (1396626342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391531898 is a wasteful number, since it uses less digits than its factorization.

1391531898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424541.

The product of its digits is 233280, while the sum is 48.

The square root of 1391531898 is about 37303.2424596040. The cubic root of 1391531898 is about 1116.4288619719.

The spelling of 1391531898 in words is "one billion, three hundred ninety-one million, five hundred thirty-one thousand, eight hundred ninety-eight".