149978399 has 2 divisors, whose sum is σ = 149978400. Its totient is φ = 149978398.

The previous prime is 149978351. The next prime is 149978407. The reversal of 149978399 is 993879941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149978399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149978329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74989199 + 74989200.

It is an arithmetic number, because the mean of its divisors is an integer number (74989200).

Almost surely, 2^149978399 is an apocalyptic number.

149978399 is a deficient number, since it is larger than the sum of its proper divisors (1).

149978399 is an equidigital number, since it uses as much as digits as its factorization.

149978399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 149978399 is about 12246.5668250330. The cubic root of 149978399 is about 531.3037783805.

The spelling of 149978399 in words is "one hundred forty-nine million, nine hundred seventy-eight thousand, three hundred ninety-nine".