1398925994 has 4 divisors (see below), whose sum is σ = 2098388994. Its totient is φ = 699462996.

The previous prime is 1398925981. The next prime is 1398925999. The reversal of 1398925994 is 4995298931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4995298931 = 7 ⋅713614133.

It can be written as a sum of positive squares in only one way, i.e., 1109755969 + 289170025 = 33313^2 + 17005^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1398925999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349731497 + ... + 349731500.

Almost surely, 2^1398925994 is an apocalyptic number.

1398925994 is a deficient number, since it is larger than the sum of its proper divisors (699463000).

1398925994 is an equidigital number, since it uses as much as digits as its factorization.

1398925994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699462999.

The product of its digits is 6298560, while the sum is 59.

The square root of 1398925994 is about 37402.2191052884. The cubic root of 1398925994 is about 1118.4028025567.

The spelling of 1398925994 in words is "one billion, three hundred ninety-eight million, nine hundred twenty-five thousand, nine hundred ninety-four".